C Tutor... C Tutorial....: January 2012

Frequently Asked Questions on Arrays and Pointers

Frequently Asked Questions on Arrays and Pointers, FAQ on Array and pointers, Pointers FAQ, FAQ on Array, Array Pointers interview Questions

I had the definition char a[6] in one source file, and in another I declared extern char *a. Why didn't it work?
But I heard that char a[] was identical to char *a.
So what is meant by the ``equivalence of pointers and arrays'' in C?
If they're so different, then why are array and pointer declarations interchangeable as function formal parameters?
So arrays are passed by reference, even though the rest of C uses pass by value?
Someone explained to me that arrays were really just constant pointers.
I'm still mystified. Is a pointer a kind of array, or is an array a kind of pointer?
I came across some ``joke'' code containing the ``expression'' 5["abcdef"] . How can this be legal C?
Since array references decay into pointers, if arr is an array, what's the difference between arr and &arr?
How do I declare a pointer to an array?
How can I set an array's size at run time?
How can I avoid fixed-sized arrays?
How can I declare local arrays of a size matching a passed-in array?
How can I dynamically allocate a multidimensional array?

strategy pattern in c++, strategy pattern Program in Cpp



#include   
 #include   
  
 using namespace std;  
   
 class CStrategyPattern {  
     public:  
        virtual ~CStrategyPattern() {  
        }  
        virtual string m_format(const string &, const string &) const=0;  
 };  
  
 class Formatter : public CStrategyPattern {  
     public:  
        string m_format(const string & s1, const string & s2) const  
        {  
            return s1 + "" + s2 + "";  
        }  
 };  
  
 void display_message(const CStrategyPattern & strategy){  
 cout << strategy.m_format("c", "cplusplus.com") << endl;  
 }  
  
 int main() {  
 display_message(Formatter());  
 return 0;  
 }

stream iterator in c++, program using stream iterator in C++



 #include   
 #include   
 #include   
 #include   
 #include   
  
 using namespace std;  
  
 int main()  
 {  
    vector coll;  
    copy (istream_iterator(cin), //start of the source  
    istream_iterator(),          //end of the source  
    back_inserter(coll));                //Final destination... :) 
      
    //To sort the elements  
    sort (coll.begin(), coll.end());  
    unique_copy (coll.begin(), coll.end(), //source  
    ostream_iterator (cout, "\n"));  
    //destination  
    return 0;  
 }

Unix shell script to get cpu usage

Unix shell script to get CPU usage


#!/bin/bash

id=0; tot=0; p_id=0; p_tot=0;

for ((i=0; $i < 100; ++i )) ; do

    p_id=$id; p_tot=$tot;
    x=`cat /proc/stat | grep -w cpu`;
    id=`echo $x | cut -d " " -f 5`;
    tot=0;
    for f in `echo $x`; do
        tot=$(($tot + $f));
    done;

    echo "idle CPU usage is % = "$((($id - $p_id)*100/($tot - $p_tot)));

    sleep 3;
done

Unix shell script to kill a process by name




if [ "$1" == "" ];then
   echo "Usage : ./pkill.sh "
else
     for i in `ps ax | grep $1 | grep -v grep | sed 's/ *//' | sed 's/[^0-9].*//'`
        do
           kill -9 $i
        done
fi

C Program TO FIND OR COUNT TOTAL NUMBER OF PALINDROME IN A GIVEN STRING


#include
#include
int stpal(char str[50], int st, int ed);
void main()
{
          char str[50];
          int pal = 0, len = 0, i, start = 0, end;
          clrscr();
          printf("\n\n\t ENTER A SENTENCE...: ");
          gets(str);
          while(str[len]!='\0')
                  len++;
          len--;
          for(i=0;i<=len;i++)
          {
                  if((str[i] == ' ' && str[i+1] != ' ') || i == len)
                  {
                           if(i == len)
                                   end = i;
                           else
                                   end = i - 1;
                           if( stpal (str, start, end ) )
                                   pal++;
                           start = end + 2;
                  }
          }
          printf("\n\n\t THE TOTAL NUMBER OF PALINDROMES ARE..: %d",pal);
          getch();
}
int stpal(char str[50], int st, int ed)
{
          int i, pal=0;
          for(i=0; i<=(ed-st)/2; i++)
          {
                  if(str[st+i] == str[ed-i])
                         pal = 1;
                  else
                  {
                         pal = 0;
                         break;
                  }
          }
          return pal;
}

C Program to print System date


#include
#include
#include
 
main()
{
   struct date d;
 
   getdate(&d);
 
   printf("Current system date is %d/%d/%d",d.da_day,d.da_mon,d.da_year);
   getch();
   return 0;
}

C Program trace path of Any WebSite, Traceroot using C language


#include
 
main()
{
   char nm[30];
   printf("Enter Any URL...");
   scanf("%s",nm);
   system("C:\\Windows\\System32\\tracert " & nm);
   system("pause");
 
   return 0;
}

C Program to Print IP address of your computer


#include
 
main()
{
   system("C:\\Windows\\System32\\ipconfig");
   system("pause");
 
   return 0;
}

Shutdown Computers using C Program in Windows 7


#include
#include
 
main()
{
   char ch;
 
   printf("Do you want to shutdown your computer now (y/n)\n");
   scanf("%c",&ch);
 
   if( ch == 'y' || ch == 'Y' )
      system("C:\\WINDOWS\\System32\\shutdown /s");
 
   return 0;
}

Well After creating EXE File, Run EXE File by right click on it & select option "Run as Administrator" then your computer will be shut down...

shutdown or turn off computer using C programming code for Windows XP


#include
#include
 
main()
{
   char ch;
   printf("Do you want to shutdown your computer now (y/n) ");
   scanf("%c",&ch);
   if( ch == 'y' || ch == 'Y' )
      system("C:\\WINDOWS\\System32\\shutdown -s");
   return 0;
}

adapter design pattern example in C++

adapter design pattern example in C++, adapter design in C plus plus, CSquareShapeAdapter Class in C++, using CSquareShapeAdapter in C++



#include   
  
 class CRoundShape  
 {  
    public:  
        virtual ~CRoundShape() { }  
        virtual void m_doRound() const=0;  
 };  
  
 class CSquareShape  
 {  
    public:  
        virtual ~CSquareShape() { }  
        virtual void m_doSquare() const=0;  
 };  
  
 class CRound_Hole  
 {  
     public:  
        void m_insert(const CRoundShape & shape) const  
        {  
            shape.m_doRound();  
        }  
 };  
  
 class CSquareShapeAdapter : public CRoundShape  
 {  
     private:  
        CSquareShape & square_shape;  
     public:  
        CSquareShapeAdapter(CSquareShape & shape) : square_shape(shape){ }  
        void m_doRound() const  
        {  
            square_shape.m_doSquare();  
        }  
 };  
  
 class CDisplayMessage : public CSquareShape  
 {  
     public:  
        void m_doSquare() const  
        {  
            std::cout << "ccplusplus.com" << std::endl;  
        }  
 };  
  
 void display_message(const CRoundShape & shape)  
 {  
 CRound_Hole().m_insert(shape);  
 }  
  
 int main()  
 {  
 CDisplayMessage shape;  
 display_message(CSquareShapeAdapter(shape));  
 return 0;  
 }

c++ Program to Sort Array in ascending order


#include   
#include   
  
using namespace std;  
  
class CSortNumbers {  
   private:  
       int i, j;  
       int arr[10];  
   public:  
       int m_swap(int *b,int *c ) {  
           int temp;  
           temp = *b;  
           *b = *c;  
           *c = temp;  
           return 0;  
       }  
       void m_takeInput () {  
           for ( i = 0; i < 10; i++ ) {  
               printf (" Enter the number %d : ", i + 1 );  
               scanf ( "%d", &arr[i] );  
           }  
       }  
       void m_display ( ) {  
           for ( i = 0; i < 10 ; i++ ) {  
               printf ( " %d " , arr[i] );     
           }  
       }  
       void m_sort () {  
           for ( i = 0; i < 10; i++ ) {  
               for ( j = 0; j < 10 - i - 1; j++ ) {  
                   if ( * ( arr + j ) > * ( arr + (j + 1) )) {  
                       m_swap ( arr + j , arr + (j + 1) );  
                   }  
               }  
           }          
       }  
};  
  
int main()  
{  
   CSortNumbers sn;  
   sn.m_takeInput ();  
   printf ("Before sorting:\n" );  
   sn.m_display ();  
   printf ( "\n" );  
   sn.m_sort();  
   printf ( "After sorting :\n" );  
   sn.m_display ();  
   printf ( "\n" );  
   return 0;  
}

sort numbers in ascending order in C


 #include   
  
 int swapNumber (int*, int*);  
  
 int main()  
 {  
    int i, j;  
    int nNumArray[10];  
  
    for ( i = 0; i < 10; i++ ) {  
        printf (" Enter the number %d : ", i + 1 );  
        scanf ( "%d", &nNumArray[i] );  
    }  
  
    printf (" Before sorting:\n" );  
    for ( i = 0; i < 10 ; i++ ) {  
        printf ( " %d " , nNumArray[i] );  
    }  
    printf ( "\n" );  
  
    for ( i = 0; i < 10; i++ ) {  
        for ( j = 0; j < 10 - i - 1; j++ ) {  
            if ( * ( nNumArray + j ) > * ( nNumArray + (j + 1) )) {  
                swapNumber ( nNumArray + j , nNumArray + (j + 1) );  
            }  
        }  
    }  
    printf ( "After sorting :\n" );  
    for ( i = 0 ; i < 10 ; i++) {  
        printf ( "%d ", nNumArray [i] );  
    }  
  
    printf ( "\n" );  
    return 0;  
 }  
  
 int swapNumber(int *npFirst,int *npSecond )  
 {  
    int temp;  
    temp = *npFirst;  
    *npFirst = *npSecond;  
    *npSecond = temp;  
    return 0;  
 }

C Program to copy one file contents to another file



void main()    
 {   
    FILE *fp1, *fp2, *fopen();   
    int c ;    
    fp1 = fopen( "ccplusplus.com",  "r" );       /* open for reading */   
    fp2 = fopen( "prog.old", "w" ) ; /* open for writing */    
    if ( fp1 == NULL )      /* check does file exist etc */   
    {   
        printf("Cannot open ccplusplus.com for reading \n" );   
        exit(1);    /* terminate program */   
    }   
    else if ( fp2 == NULL )   
    {   
        printf("Cannot open prog.old for writing \n");   
        exit(1);    /* terminate program */   
    }   
    else   /* both files O.K. */   
    {   
        c = getc(fp1) ;     
        while ( c != EOF)   
        {   
            putc( c,  fp2);    /* copy to prog.old */   
            c =  getc( fp1 ) ;   
        }   
        fclose ( fp1 );   /* Now close files */   
        fclose ( fp2 );   
        printf("Files successfully copied \n");   
    }   
 }

c program to sort given numbers in ascending order



int swapNumber (int*, int*);  
  
 int main()  
 {  
    int i, j;  
    int nNumArray[10];  
  
    for ( i = 0; i < 10; i++ ) {  
        printf (" Enter the number %d : ", i + 1 );  
        scanf ( "%d", &nNumArray[i] );  
    }  
  
    printf (" Before sorting:\n" );  
    for ( i = 0; i < 10 ; i++ ) {  
        printf ( " %d " , nNumArray[i] );  
    }  
    printf ( "\n" );  
  
    for ( i = 0; i < 10; i++ ) 
{  
        for ( j = 0; j < 10 - i - 1; j++ ) 
{  
            if ( * ( nNumArray + j ) > * ( nNumArray + (j + 1) )) 
{  
                swapNumber ( nNumArray + j , nNumArray + (j + 1) );  
            }  
        }  
    }  
    printf ( "After sorting :\n" );  
    for ( i = 0 ; i < 10 ; i++) {  
        printf ( "%d ", nNumArray [i] );  
    }  
  
    printf ( "\n" );  
    return 0;  
 }  
  
 int swapNumber(int *npFirst,int *npSecond )  
 {  
    int temp;  
    temp = *npFirst;  
    *npFirst = *npSecond;  
    *npSecond = temp;  
    return 0;  
 }

C Program On Pointers & 2 - Dimensional Array.

C Program On Pointers & 2 - Dimensional Array, 2D Array & Pointers



#include 
#include 

void input(int**, int, int);
void show(int**, int, int);

main()
{

int a[3][3];
int row = 3, col = 3;
clrscr();

input(( int** )a, row, col);
show(( int** )a, row, col);

getch();
return 0;

}

void input(int **p, int r, int c)
{

int i, j;
for( i = 0; i < r; i++ )
  {
     for( j = 0; j < c; j++ )
       {
          printf(" \n Enter p[%d][%d] element: ", i, j);
          scanf(" %d ", *(p + i) + j);
       }
  }

}

void show(int **p, int r, int c)
{

int i, j;
printf(" \n Matrix is\n ");

for( i = 0; i < r; i++ )
  {
     for( j = 0; j < c; j++ )
          printf(" %d ", *(*(p + i) + j));

printf(" \n ");

  }

}

Floyd’s Triangle printing using C.


#include 
#include 
void main()
{

int n, i, sum = 0;
clrscr();

printf(" Enter any number: " );
scanf(" %d ", &n);

for(i = 1; i<n; i = i + 2 )
{
printf(" %d + ", i);
sum = sum + i;
}
printf(" %d ", n);
printf(" \nSum = %d ", sum + n );
getch();

}

C Program To Print Size Of Commonly Used Data Types.




#include 
#include 

main ()
{

clrscr();
printf ("\n An int is %d bytes", sizeof (int));
printf ("\n A char is %d bytes", sizeof (char));
printf ("\n A short is %d bytes", sizeof (short));

printf ("\n A long is %d bytes", sizeof (long));
printf ("\n A float is %d bytes", sizeof (float));
printf ("\n A double is %d bytes", sizeof (double));

printf ("\n An unsigned char is %d bytes", sizeof (unsigned char));
printf ("\n An unsigned int is %d bytes", sizeof (unsigned int));
return 0;

}

C Program To Accept Floating Point Numbers & Print Average.



#include 
#include 

int main(void)
{

float a, b, c, d, avg=0;
clrscr();
printf("\n Enter the four floating point no's.\n");

scanf(" %f %f %f %f " ,&a, &b, &c, &d);
avg = ( a + b + c + d ) / 4;
printf("\n The average is = %10.5f",avg);
getch();
return 0;

}

Program to Concatenation Two Strings In C


 #include
#include
void stcat(char *str1, char *str2);
void main()
{
        char *str1, *str2;
        clrscr();
        printf("\n\n\t ENTER THE FIRST STRING...: ");
        gets(str1);
        printf("\n\n\t ENTER THE SECOND STRING...: ");
        gets(str2);
        stcat(str1,str2);
        printf("\n\t THE CONCATENATED STRING IS...: ");
        puts(str1);
        getch();
}
void stcat (char *str1, char *str2)
{
        int i = 0,len = 0;
        while(*(str1+len)!='\0')
        len++;
       while(*(str2+i)!='\0')
       {
               *(str1+len) = *(str2+i);
               i++;
               len++;
       }
       *(str1+len) = '\0';
}

Program to Find HCF Using C Program


#include
#include
int hcf(int , int );
void main()
{
    int a,b,c;
    char ch;
   do{
    
         clrscr();
         printf("\n Enter 1st no:");
         scanf("%d",&a);
         printf("\n enter 2nd no:");
         scanf("%d",&b);
         c=hcf(a,b);
         printf(" \n <%d> and <%d> HCF value [%d]",a,b,c);
         printf(" \n  Continue (Y/N) :");
        ch=getch();
    }while(ch=='y'||ch=='Y');
}
int hcf(int x,int y)
{
    int b,s,r;

    if(x>y)
    {
         b=x;
         s=y;
    }
    else
    {
        b=y;
        s=x;
    }
    r=b%s;
    while(r!=0)
    {
        b=s;
        s=r;
        r=b%s;
    }
    return s;
}

C Program To Multiply Two Matrix

C Program To Multiply Two Matrix, Multiplication of 3x3 Matrix in C


#include 
#include 
#include 
main()
{
int a[3][3], b[3][3], c[3][3];
int i, j, k;
clrscr();
printf(" Enter elements of first matrix\n ");
for( i = 0; i < 3; i++ )
  {
    for( j = 0; j < 3; j++ )
      {
         printf(" \n Enter a[%d] [%d] element: ", i, j);
         scanf(" %d ", &a[i] [j] );
      }
  }
printf(" Enter elements of second matrix\n ");
for( i = 0; i < 3; i++ )
  {
    for( j = 0; j < 3; j++ )
      {
         printf(" \n Enter b[%d] [%d] element: ", i, j );
         scanf(" %d ", &b[i][j]);
      }
  }
printf(" \n\n First matrix is\n\n ");
for( i = 0; i < 3; i++ )
  {
     for( j = 0; j < 3; j++ )
           printf(" %2d ", a[i][j]);
     printf(" \n ");
  }

printf(" \n\nSecond matrix is\n ");
for( i = 0; i < 3; i++ )
  {
     for( j = 0; j < 3; j++ )
          printf(" %2d ", b[i][j]);
     printf(" \n ");
  }
for( i = 0; i < 3; i++ )
  {
    for( j = 0; j < 3; j++ )
     {
        c[i][j] = 0;
        for( k = 0; k < 3; k++ )
              c[i][j] = c[i][j] + a[i][k] * b[k][j];
     }
  }
printf(" \n\n Multiplication of two matrices is\n ");
for( i = 0; i < 3; i++ )
  {
     for(j = 0; j < 3; j++ )
          printf(" %2d ", c[i][j]);
     printf(" \n ");
  }
getch();
}

C Program To Insert An Element In An Array, insertion in Array


#include 
#include 
#include 
#define S 7

main()
{
int arr[10];
int i, pos, num, j;
clrscr();
for( i = 0; i < S; i++ )
  {
     printf("\n Enter arr[%d] element: ", i);
     scanf(" %d ", &arr[i] );
  }

clrscr();
printf(" \n\nArray is \n\n ");

for( i = 0; i < S; i++ )
     printf(" %2d ", arr[i] );

printf(" \nEnter the element which you want to insert\n ");
scanf(" %d ", &num );
printf(" \nEnter the position (first is 0)\n " );
scanf("%d", &pos);

if( pos > = 0 && pos <= 9)
  {
     for( j = S;j > pos; j-- )
           arr[j] = arr[j-1];

     arr[j] = num;
}
else
  {
      printf(" Wrong position selected\n ");
      getch();
     exit(1);
  }

printf(" Array after insertion\n ");
for(i = 0; i < S; i++ )
     printf(" %d ", arr[i]);

getch();
}

C Program For Entering An Array Of Elements.


#include 
#include 
#define S 5

main()
{
int a[S];
int i;
clrscr();
for( i = 0; i < S; i++ )
{
    printf("\n Enter a[%d] element: ",i);
    scanf("%d", &a[i]);
}
printf("Array elements are\n");
for( i = 0; i < S; i++ )
{
    printf("a[%d] = %d\n", i, a[i]);
}
getch();
}

C Program To Find Transpose a 3 x 2 matrix.



#include 
#include 
#include 

main()
{

int arr[3] [2];
int i, j;
clrscr();

printf(" Enter the 6 elements of matrix\n ");
for( i = 0; i < 3; i++ )
   for( j = 0; j < 2; j++ )
       scanf(" %d ", &arr[i] [j]);
 
printf(" The matrix is\n ");
for( i = 0; i < 3; i++ )
  {
    for( j = 0; j < 2; j++ )
    printf(" %d ", arr[i] [j]);
    printf(" \n ");
  }

printf(" The Transposed Matrix is\n ");

for( i = 0; i < 2; i++ )
  {
    for( j = 0; j < 3; j++ )
        printf(" %d ", arr[j] [i]);
        printf("\n");
  }

getch();

}

c program to find out the sum of G.P series

c program to find out the sum of G.P series, GP Series in C, C Program to find G.P. Series.


#include
#include

int main(){

    float a,r,i,tn;
    int n;
    float sum=0;

    printf("Enter the first number of the G.P. series: ");
    scanf("%f",&a);

    printf("Enter the total numbers in the G.P. series: ");
    scanf("%d",&n);

    printf("Enter the common ratio of G.P. series: ");
    scanf("%f",&r);

    sum = (a*(1 - pow(r,n+1)))/(1-r);
       tn = a * (1 -pow(r,n-1));

    printf("tn term of G.P.: %f",tn);
    printf("\nSum of the G.P.: %f",sum);

    return 0;
}

c program to find the area of a trapezium

c program to find the area of a trapezium , Area of trapezium in C, C Language to find trapezium area.



#include

int main(){

    float b1,b2,h;
    float area;

    printf("Enter the size of two bases and height of the trapezium : ");
    scanf("%f%f%f",&b1,&b2,&h);

    area = 0.5 * ( b1 + b2 ) * h ;

    printf("Area of trapezium is: %.3f",area);

    return 0;
}

C Program On Pointers and 2 - Dimensional Array.



#include 
#include 
void main ()
{
int i, total;
int arr[10];
int *a;
a = arr;
for(i=0;i<10;i++ )
   {
       printf ("Enter the number %d:",i+1);
       scanf ("%d",&arr[i] );
    }
for(i=0;i<10;i++)
    {
        printf("%d---",*a);
        total=total+*a;
        a=a+1;
    }
printf("\nTotal = %d \n",total);
 }

C Program To Accept & Add Ten Numbers Using Pointers.


#include 
#include 

void main ()
{

int i, total;
int arr[10];
int *a;

a = arr;
for(i=0;i<10;i++)
   {
       printf ("Enter the number %d:", i+1 );
       scanf ("%d", &arr[i] );
    }

for(i=0;i<10;i++)
    {
        printf ( " %d--- ", *a );
        total = total + *a;
        a = a + 1;
    }

printf ("\nTotal = %d \n",total);
getch();

 }

using binary minus operator Write a c program to find largest among three numbers


#include
int main()
{
    int a,b,c;
    printf("\n Please Enter the 3 numbers: ");
    scanf("%d %d %d",&a,&b,&c);
    if(a-b>0 && a-c>0)
         printf("\n Greatest is a :%d",a);
    else
         if(b-c>0)
             printf("\n Greatest is b :%d",b);
         else
             printf("\n Greatest is c :%d",c);
    return 0;
}

c program to subtract two numbers without using subtraction operator


#include

int main(){
   
    int a,b;
    int sum;

    printf("Enter any two integers: ");
    scanf("%d%d",&a,&b);

    sum = a + ~b + 1;

    printf("Difference of two integers: %d",sum);

    return 0;
}

c program to add two numbers without using addition operator



#include

int main()
{
   
    int a,b;
    int sum;

    printf("Enter any two integers: ");
    scanf("%d%d",&a,&b);

    //sum = a - (-b);
    sum = a - ~b -1;

    printf("Sum of two integers: %d",sum);

    return 0;
}



Well Friend the Algorithm of this program is as follows : 


Algorithm:
In c ~ is 1's complement operator. This is equivalent to:  
~a = -b + 1
So, a - ~b -1
= a-(-b + 1) + 1
= a + b – 1 + 1
= a + b

C program to print perfect numbers from 1 to 100

#include
int main(){
 int n,i,sum;

 printf("Perfect numbers are: ");
 for(n=1;n<=100;n++){
   i=1;
   sum = 0;

   while(i<n){
     if(n%i==0)
          sum=sum+i;
         i++;
   }

   if(sum==n)
     printf("%d ",n);
 }

 return 0;
}

Perfect number is a positive number which sum of all positive divisors excluding that number is equal to that number. For example 6 is perfect number since divisor of 6 are 1, 2 and 3. Sum of its divisor is
1 + 2+ 3 =6

Note: 6 is the smallest perfect number.

Next perfect number is 28 since 1+ 2 + 4 + 7 + 14 = 28
Some more perfect numbers: 496, 8128

C program to check perfect number Or Not


#include
int main(){
  int n,i=1,sum=0;

  printf("Enter a number: ");
  scanf("%d",&n);

  while(i<n){
      if(n%i==0)
           sum=sum+i;
          i++;
  }
  if(sum==n)
      printf("%d is a perfect number",i);
  else
      printf("%d is not a perfect number",i);

  return 0;
}

Sum of diagonal elements of a matrix in c


#include

int main(){

  int a[10][10],i,j,sum=0,m,n;

  printf("\nEnter the row and column of matrix: ");
  scanf("%d %d",&m,&n);

  printf("\nEnter the elements of matrix: ");
  for(i=0;i<m;i++)
      for(j=0;j<n;j++)
           scanf("%d",&a[i][j]);
  printf("\nThe matrix is\n");

  for(i=0;i<m;i++){
      printf("\n");
      for(j=0;j<m;j++){
      printf("%d\t",a[i][j]);
      }
 }
 for(i=0;i<m;i++){
     for(j=0;j<n;j++){
          if(i==j)
              sum=sum+a[i][j];
     }
 }
 printf("\n\n Sum of the diagonal elements of a matrix is: %d",sum);

 return 0;
}

Program on array manipulations using c, array manipulations in C, C array manupulations

Program on array manipulations using c, array manipulations in C


#include 

main()

{

int a[20],b[20],n,i,j,temp,sb,ss,sbp,ssp;

clrscr();

printf("ENTER HOW MANY ELEMENTS\n");

scanf("%d",&n);

printf("ENTER %d ELEMENTS\n",n);

for (i=0;i

scanf("%d",&a[i]);

for (i=0;i

b[i]=a[i];

for (i=0;i

{

for (j=i+1;j

if (a[i]

{

   temp=a[i];

   a[i]=a[j];

   a[j]=temp;

}
}
sb=a[1];
ss=a[n-2];
for (i=0;i
{
for (j=i+1;j
{
if (b[i]==sb)
   sbp=i;
if (b[i]==ss)
   ssp=i;
}
}
b[sbp]=ss;

b[ssp]=sb;

printf("AFTER INTERCHANGING THE SECOND BIGGEST ELEMENT AND\n");

printf("THE SECOND SMALLEST ELEMENT THE ARRAY IS\n");

for (i=0;i

printf("%d\n",b[i]);

getch();

}

C Program to find out the given number is automorphic or not

C Program to find out the given number is automorphic or not, Automorphism Numbers in C, automorphic Numbers finding in C



#include 

main()

{

int n;

clrscr();

puts("ENTER ANY NUMBER");

scanf("%d",&n);

if (n*n%10==n || n*n%100==n || n*n%1000==n)

puts("THIS IS AN AUTOMORPHIC NUMBER");

else

puts("THIS IS NOT AN AUTOMORPHIC NUMBER");

getch();

}

C Program to find the biggest of the given numbers


#include 

main()

{

int a[30],big=0,n;

register int i;

clrscr();

printf("HOW MANY NUMBERS YOU WANT TO ENTER\n");

scanf("%d",&n);

printf("ENTER %d NUMBERS\n",n);

for (i=0;i

scanf("%d",&a[i]);

for (i=0;i

{

if (big

big=a[i];

}

printf("THE BIGGEST ELEMENT IS %d",big);

getch();

}

C Program to print the multiplication table



#include 

main()

{

int n,m;

register int i;

clrscr();

printf("WHICH TABLE YOU WANT\n");

scanf("%d",&n);

printf("UPTO WHICH NUMBER\n");

scanf("%d",&m);

for (i=1;i<=m;i++)

printf("%d * %d = %d\n",n,i,n*i);

getch();

}

Program to read 9 elements and print them in 3 x 3 matrix form using c Language


#include 

main()

{

int a[9],c=0;

register int i;

clrscr();

printf("ENTER 9 ELEMENTS\n");

for (i=0;i<9;i++)

scanf("%d",&a[i]);

printf("THE ELEMENTS IN 3*3 MATRIX FORM IS\n");

for (i=0;i<9;i++)

{

printf("%2d",a[i]);

c++;

if (c%3==0)

printf("\n");

}

getch();

}

C program to print Pascal triangle using for loop, Pascal triangle program in c language

Pascal triangle program in c language



#include

long fact(int);
int main(){
    int line,i,j;

    printf("Enter the no. of lines: ");
    scanf("%d",&line);

    for(i=0;i<line;i++){
         for(j=0;j<line-i-1;j++)
             printf(" ");

         for(j=0;j<=i;j++)
             printf("%ld ",fact(i)/(fact(j)*fact(i-j)));
         printf("\n");
    }
    return 0;
}

long fact(int num){
    long f=1;
    int i=1;
    while(i<=num){
         f=f*i;
         i++;
  }
  return f;
 }

using binary minus operator find largest among three numbers in C


#include
int main(){
    int a,b,c;
    printf("\nEnter 3 numbers: ");
    scanf("%d %d %d",&a,&b,&c);
    if(a-b>0 && a-c>0)
         printf("\nGreatest is a :%d",a);
    else
         if(b-c>0)
             printf("\nGreatest is b :%d",b);
         else
             printf("\nGreatest is c :%d",c);
    return 0;
}

Convert string to int without using library functions in c


#include

int stringToInt(char[] );
int main()
{  
    char str[10];
    int intValue;
    printf("Please Enter any integer as a string: ");
    scanf("%s",str);
   intValue = stringToInt(str);
    printf("Equivalent integer value: %d",intValue);
    return 0;
}

int stringToInt(char str[])
   {
    int i=0,sum=0;
    while(str[i]!='\0'){
         if(str[i]< 48 || str[i] > 57){
             printf("Unable to convert it into integer.\n");
             return 0;
         }
         else
  {
             sum = sum*10 + (str[i] - 48);
             i++;
         }

    }

    return sum;

}

c Program to print 1 to 100 without using loop


#include

int main(){
    int i= 1;

    print(i);

    return 0;
}
int print(i){
    if(i<=100){
         printf("%d ",i);
         print(i+1);
    }
}

C Program to calculate Electric Bill


#include
#include
void main()
{
   int cno,pmr,cmr,cu;
   float total;
   char sec;
   char cname[10];
   clrscr();
   printf(" ENTER the SECTOR     : ");
   scanf("%c",&sec);
   printf(" Enter customer name   : ");
   scanf("%s",&cname);
   printf(" Enter customer number  :     ");
   scanf("%d",cno);
   printf(" Enter the previous units  : ");
   scanf("%d",&pmr);
   printf(" Enter the current units  : ");
   scanf("%d",&cmr);
   cu=cmr-pmr;
   if(sec == 'a')
   {
      if(cu>300)
      total=cu*2.00;
if(cu>200  && cu<=300)
total=cu*1.50;
 if(cu>100 && cu<=200)
 total=cu*1.00;
   if(cu<=100)
   total=cu*0.50;
   }
   if(sec=='i')
   {
      if(cu>300)
      total=cu*4.00;
if(cu>200  && cu<=300)
total=cu*3.00;
if(cu>100 && cu<=200)
 total=cu*2.00;
   if(cu<=100)
   total=cu*1.00;
   }
    if(sec == 'a')
   {
      if(cu>300)
      total=cu*2.00;
if(cu>200  && cu<=300)
total=cu*1.50;
 if(cu>100 && cu<=200)
 total=cu*1.00;
   if(cu<=100)
   total=cu*0.50;
   }
    if(sec == 'd')
   {
      if(cu>300)
      total=cu*2.00;
if(cu>200  && cu<=300)
total=cu*1.50;
 if(cu>100 && cu<=200)
 total=cu*1.00;
   if(cu<=100)
   total=cu*0.50;
   }
   printf("\n Customer name   :   %s ",cname);
   printf("\n Customer number :   %d",cno);
   printf("\n Previous Units  :   %d",pmr);
   printf("\n Current Units   :   %d",cmr);
   printf("\n Category        :   %c",sec);
   printf("\n Consumed Units  :   %d",cu);
   printf("\n Electric Bill   :   %f",total);
   getch();
   }

C Program To Print Sum Of Series 1 + 3 + 5 + …. N.

C Program To Print Sum Of Series 1 + 3 + 5 +.... N


#include 
#include 
void main()
{

int n, i, sum = 0;
clrscr();

printf(" Enter any number: " );
scanf(" %d ", &n);

for(i = 1; i<n; i = i + 2 )
{
printf(" %d + ", i);
sum = sum + i;
}
printf(" %d ", n);
printf(" \nSum = %d ", sum + n );
getch();

}

C Program To Display The Days In A Week using Switch Case

C Program To Display The Days In A Week.



#include 
#include 
void main()
{

char ch;
clrscr();
printf(" Enter m for Monday\n t for Tuesday\n w for Wednesday\n h for Thursday\n f for Friday\n s for Saturday\n u for Sunday ");

scanf(" %c ", &ch);

switch(ch)
   {
      case 'm':
      case 'M':
      printf("The day is Monday");
      break;

      case 't':
      case 'T':
      printf("The day is Tuesday");
      break;

      case 'w':
      case 'W':
      printf("The day is Wednesday");
      break;

      case 'h':
      case 'H':
      printf("The day is Thursday");
      break;

      case 'f':
      case 'F':
      printf("The day is Friday");
      break;

      case 's':
      case 'S':
      printf("The day is Saturday");
      break;

      case 'u':
      case 'U':
      printf("The day is Sunday");
      break;

     default :
     printf("Wrong input!");
     break;
   }
getch();

}

C Program To Find The Reverse Of A Number.


#include 
#include 

void main()
{

int n, a, r=0;
clrscr();

printf(" Enter any number to get its reverse: ");
scanf("%d",&n);
while(n>=1)
{
a = n % 10;
r = r * 10 + a;
n = n / 10;
}
printf(" Reverse = %d",r);
getch();

}

C Program To Convert Celsius Temperature To Fahrenheit.



#include 
#include 

void main()
{

float c, f;
clrscr();

printf(" Please Enter Temperature in centigrade: ");
scanf("%f",&c);

f = ( 1.8 * c ) + 32;
printf(" Temperature in Fahrenheit = %f", f);
getch();

}

C Program To Accept Floating Point Numbers & Print Average.




#include 
#include 

int main(void)
{

float a, b, c, d, avg=0;
clrscr();
printf("\n Enter the four floating point no's.\n");

scanf(" %f %f %f %f " ,&a, &b, &c, &d);
avg = ( a + b + c + d ) / 4;
printf("\n The average is = %10.5f",avg);
getch();
return 0;

}

C Program To Sort Numbers In Ascending Numbers.


#include 
#include 

swap (int*, int*);

main()
{

clrscr();
int i, j;
int arr[10];
int *a;
a=arr;

for ( i = 0; i < 10; i++ )
   {
      printf (" Enter the number %d : ", i + 1 );
      scanf ( "%d", &arr[i] );
   }

printf (" Before sorting:\n" );

for ( i = 0; i < 10 ; i++ )
      printf ( " %d " , arr[i] );

printf ( "\n" );

for ( i = 0; i < 10; i++ )
    for ( j = 0; j < 10 - i - 1; j++ )
           if ( * ( arr + j ) > * ( arr + (j + 1) )
               swap ( arr + j , arr + (j + 1) );

printf ( "After sorting :\n" );

for ( i = 0 ; i < 10 ; i++)
     printf ( "%d ", arr [i] );

printf ( "\n" );
return 0;

}

swap(int *b,int *c )
{

int temp;
temp = *b;
*b = *c;
*c = temp;
return 0;

}

C Program to Print Memory Size of Variable

C Program To Specify Size Of Commonly Used Data Types, C Program to Find Memory size Require for Data types, Program to Print Memory Size of Variable.



#include 
#include 

main ()
{

clrscr();
printf ("\n An int is %d bytes", sizeof (int));
printf ("\n A char is %d bytes", sizeof (char));
printf ("\n A short is %d bytes", sizeof (short));

printf ("\n A long is %d bytes", sizeof (long));
printf ("\n A float is %d bytes", sizeof (float));
printf ("\n A double is %d bytes", sizeof (double));

printf ("\n An unsigned char is %d bytes", sizeof (unsigned char));
printf ("\n An unsigned int is %d bytes", sizeof (unsigned int));
return 0;

}