Program To Overlead Operator, Using Two Data Members, And Member Functions. 






class distance

{

float point;

public:

distance()

{

    point=0.0;

}

distance(float p)

{

    point =p;

}



distance operator+(distance x)

{

    distance temp;

    temp.point=point+x.point;

    return temp;

}



distance operator-(distance x)

{

    distance temp;

temp.point=point-x.point;

if(temp.point<0)

    return distance(0);

else

return temp;

}

void show(){

    cout<}

};



void main()

{

    clrscr();

    distance d1(5),d2(2),d3;

d3=    d2.operator +(d1);

    d3.show();



d3=    d2.operator -(d1);

    d3.show();

    getch();

}
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Program to create Analog Clock in c 




# include 
# include 
# include 
# include 
# include <.h>
# include 

void frame();
void star_in(int, int, int, int, int, float, float);
void line_at_angle(int, float, int);
void beep(int, int);
void clear (int, int, int, int, int);

void main()
{
  int gdriver=DETECT,gmode,errorcode;
  initgraph(&gdriver,&gmode,"c:\tc\bgi");
  errorcode=graphresult();
  if(errorcode!=grOk)
  {
    printf("Opps!! Graphics error  %s",grapherrormsg(errorcode));
    printf("press any key to halt.");
    exit(1);
  }
  struct time t;
  gettime(&t);
  int key,k=0;
  int midx,midy;
  float hour;
  midx=getmaxx()/2;
  midy=getmaxy()/2;

  frame();

  while(1)
  {
    if(kbhit())
    {
      key=getch();
      if(key==27)
      break;
    }
    gettime(&t);

    if(t.ti_hour>=12)
    hour=t.ti_hour-12;

    float ang_sec=t.ti_sec*6;
    float ang_min=(t.ti_min*6)+(ang_sec/60);
    float ang_hour=(hour*30)+(ang_min/12);

    setcolor(4);
    setfillstyle(1,9);
    line_at_angle(150,ang_min,2);  //min
    setcolor(12);
    setfillstyle(1,4);
    line_at_angle(130,ang_hour,3);  //hour
    setcolor(14);
    line_at_angle(170,ang_sec,1);  //sec
    line_at_angle(20,180+ang_sec,1);  //sec

    setfillstyle(1,4);
    setcolor(13);
//    fillellipse(midx,midy,2,2);
    star_in(midx, midy+1, 6, 2, 4, 0, 0);
    char tim[5];
    struct time t;
    int t_sec,t_min;
    int x=520,y=460;
    gettime(&t);
    if(t.ti_hour>12)
    {
      outtextxy(x+80,y,"PM");
      sprintf(tim,"%d",t.ti_hour-12);
    }
    else
    {
      outtextxy(x+80,y,"AM");
      sprintf(tim,"%d",t.ti_hour);
    }
    outtextxy(x,y,tim);
    outtextxy(x+16,y,":");
    outtextxy(x+42,y,":");
    sprintf(tim,"%d",t.ti_min);
    outtextxy(x+26,y,tim);
    sprintf(tim,"%d",t.ti_sec);
    outtextxy(x+50,y,tim);

    k++;
    if(k==10)
    {
      k=0;
      beep(100,50);
    }
    else
    delay(100);
    t_sec = t.ti_sec;
    t_min = t.ti_min;
    clear(x+50,y,x+70,y+8,0);
    if(t_sec >= 59)
    clear(x+26,y,x+46,y+8,0);
    if(t_min >= 59)
    clear(x,y,x+20,y+8,0);

    setcolor(0);
    setfillstyle(1,0);
    line_at_angle(130,ang_hour-6,1);
    line_at_angle(150,ang_min-4,1);
    line_at_angle(170,ang_sec,1);
    line_at_angle(20,180+ang_sec,1);
    ang_sec++;
  }

  closegraph();
}
void frame()
{
  int midx,midy;
  float angle=0;
  float x,y;
  midx=getmaxx()/2;
  midy=getmaxy()/2;

  setlinestyle(1,1,3);
  setcolor(2);
  circle(midx,midy,223);
  setcolor(15);
  circle(midx,midy,220);
  setcolor(12);
  circle(midx,midy,217);
  setlinestyle(1,1,3);
  setfillstyle(1,2);
  setcolor(4);
  for(int i=0;i<=60;i++)
  {
    x=cos((angle/180)*M_PI)*190;
    y=sin((angle/180)*M_PI)*190;
    if(int(angle)%30!=0)
    circle(midx+x,midy+y,2);
    angle+=6;
  }
  angle=0;
  setfillstyle(1,4);
  setlinestyle(0,1,2);
  for(i=0;i<12;i++)
  {
    setcolor(13);
    x=cos((angle/180)*M_PI)*190;
    y=sin((angle/180)*M_PI)*190;
    if(i%3==0)
    {
//      fillellipse(midx+x,midy+y,6,6);
      setcolor(10);
      star_in(midx+x, midy+y, 12, 6, 5, 18, 0);
      setcolor(14);
      star_in(midx+x, midy+y, 6, 3, 5, 18, 0);
    }
    else
 //   fillellipse(midx+x,midy+y,4,4);
    star_in(midx+x, midy+y, 8, 3, 5, 18, 0);
    angle+=30;
  }
}

void line_at_angle(int radius, float angle, int flag)
{
  float x,y,x1,y1,x2,y2,x3,y3;
  int midx,midy;
  angle-=90;

  midx=getmaxx()/2;
  midy=getmaxy()/2;

  x=cos((angle/180)*M_PI)*radius;
  y=sin((angle/180)*M_PI)*radius;

  setlinestyle(0,1,3);
  if(flag==1)
  line(midx,midy,midx+x,midy+y);
  if(flag==2)
  {
    setlinestyle(0,1,1);
    x2=cos(((angle+3)/180)*M_PI)*(radius-25);
    y2=sin(((angle+3)/180)*M_PI)*(radius-25);
    x3=cos(((angle-3)/180)*M_PI)*(radius-25);
    y3=sin(((angle-3)/180)*M_PI)*(radius-25);
    int
poly1[10]={midx,midy,midx+x2,midy+y2,midx+x,midy+y,midx+x3,midy+y3,midx,mi
dy};
    fillpoly(5,poly1);
    setcolor(0);
    x2=cos(((angle)/180)*M_PI)*(radius+1);
    y2=sin(((angle)/180)*M_PI)*(radius+1);
    x3=cos(((angle-4)/180)*M_PI)*(radius-25);
    y3=sin(((angle-4)/180)*M_PI)*(radius-25);
    line(midx+x2,midy+y2,midx+x3,midy+y3);
    line(midx+x,midy+y,midx+x3,midy+y3);
  }
  else if(flag==3)
  {
    setlinestyle(0,1,1);
    x2=cos(((angle+5)/180)*M_PI)*(radius-30);
    y2=sin(((angle+5)/180)*M_PI)*(radius-30);
    x3=cos(((angle-5)/180)*M_PI)*(radius-30);
    y3=sin(((angle-5)/180)*M_PI)*(radius-30);
    int
poly1[10]={midx,midy,midx+x2,midy+y2,midx+x,midy+y,midx+x3,midy+y3,midx,mi
dy};
    fillpoly(5,poly1);
    setcolor(0);
    x2=cos(((angle)/180)*M_PI)*(radius+1);
    y2=sin(((angle)/180)*M_PI)*(radius+1);
    x3=cos(((angle-6)/180)*M_PI)*(radius-30);
    y3=sin(((angle-6)/180)*M_PI)*(radius-30);
    line(midx+x2,midy+y2,midx+x3,midy+y3);
    line(midx+x,midy+y,midx+x3,midy+y3);
  }
}
void beep(int fre,int wait)
{
  sound(fre);
  delay(wait);
  nosound();
}
  void star_in(int x, int y, int r1, int r2, int points, float
angle_intial1, float offset)
  {
    float angle, theta;
    int number = 0;
    float xi1, yi1, xf1, yf1, xc1, yc1;
    float xi2, yi2, xf2, yf2, xc2, yc2;
    float angle_intial2;
    float xt,yt;

    theta = 360 / points;
    angle_intial2 = angle_intial1 + (theta / 2) + offset;
    angle_intial1 = (angle_intial1 * M_PI) / 180;
    angle_intial2 = (angle_intial2 * M_PI) / 180;

    angle = theta;

    xc1 = x + (r1 * cos(angle_intial1)),
    yc1 = y - (r1 * sin(angle_intial1));
    xc2 = x + (r2 * cos(angle_intial2)),
    yc2 = y - (r2 * sin(angle_intial2));

    xi1 = xc1,
    yi1 = yc1;
    xi2 = xc2,
    yi2 = yc2;

    xt = xc1;
    yt = yc1;

    while(number <= points + 1)
    {
      angle = (angle * M_PI) / 180;

      xc1 = xc1 - x;
      yc1 = yc1 - y;
      xc2 = xc2 - x;
      yc2 = yc2 - y;

      xf1 = ( xc1 * cos(angle) ) - ( yc1 * sin( angle ) );
      yf1 = ( xc1 * sin(angle) ) + ( yc1 * cos( angle ) );
      xf2 = ( xc2 * cos(angle) ) - ( yc2 * sin( angle ) );
      yf2 = ( xc2 * sin(angle) ) + ( yc2 * cos( angle ) );

      xc1 = xc1 + x;
      yc1 = yc1 + y;
      xc2 = xc2 + x;
      yc2 = yc2 + y;

      xf1 = xf1 + x;
      yf1 = yf1 + y;
      xf2 = xf2 + x;
      yf2 = yf2 + y;

      if(number != points + 1)
      line(xi1, yi1, xi2, yi2);
      line(xt, yt, xi2, yi2);

      xt = xi1;
      yt = yi1;

      xi1 = xf1,
      yi1 = yf1;
      xi2 = xf2,
      yi2 = yf2;

      number++;
      angle = theta * number;
    }
  }

void clear(int x1, int y1, int x2, int y2, int col)
{
    int x,y;
    for(x=x1;x<=x2;x++)
    for(y=y1;y<=y2;y++)
    putpixel(x,y,col);
}
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xstrcmp() - compares strings using DOS wildcards ** 'mask' may contain '*' and '?' 


int xstrcmp (char *mask, char *s)
{
      while (*mask)
      {
            switch (*mask)
            {
            case '?':
                  if (!*s)
                        return (0);
                  s++;
                  mask++;
                  break;

            case '*':
                  while (*mask == '*')
                        mask++;
                  if (!*mask)
                        return ( 1 );
                  if (*mask == '?')
                        break;
                  while (*s != *mask)
                  {
                        if (!*s)
                              return (0);
                        s++;
                  }
                  s++;
                  mask++;
                  break;

            default:
                  if (*s != *mask)
                        return (0);
                  s++;
                  mask++;
            }
      }

      if (!*s && *mask)
            return (0);
      return ( 1 );
}

#ifdef TEST

#include 
void main(int argc, char *argv[])
{
      if (3 != argc)
      {
            puts("Usage: XSTRCMP string_1 string_2");
            return;
      }
      printf("xstrcmp(\"%s\", \"%s\") returned %d\n", argv[1], argv[2],
            xstrcmp(argv[1], argv[2]));
}

#endif /* TEST */
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Program to Infix To Prefix Conversion in C 


#include

#include

#include

#define MAX 15

#define true 1

#define false 0





typedef struct

{

char data[MAX];

char top;

}STK;



void input(char str[]);

void intopre(char str1[],char pre[]);

void intopost(char str1[],char post[]);

int isoperand(char sym);

int prcd(char sym);

void push(STK *s1,char elem);

int pop(STK *s1);

int empty(STK *s2);

int full(STK *s2);

void dis(char str[]);



void main()

{

STK s;

int cs,ans;

char str[MAX],pre[MAX],post[MAX];

clrscr();

do                                                   /*Using Do-while Loop*/

{

clrscr();

printf("

		-----Program for Expressions-----");

printf("

Input The String:");

printf("

MENU:

");

printf("1.Infix to Prefix

");

printf("2.Infix to Postfix");

printf("

3.Exit");

cs=getche();



switch(cs)  /*Using Switch Case*/

{

case 1:

intopre(str,pre);

break;

case 2:

intopost(str,post);

break;

case 3:

break;

default:

printf("

Enter a Valid Choise!"); /*Default Case*/

break;

}

printf("

Do you wish to Continue?(y/n)");

ans=getche();

}while(ans=='y'||ans=='Y');   /*Condition for Do-while loop*/



getch();

}



/**************************************************/

/*To Input String*/

/**************************************************/

void input(char str)

{

printf("Enter the Infix String:");

scanf("%s",str);

}



/**************************************************/

/*To Covert Infix To Prefix*/

/**************************************************/

void intopre(STK s1,char str1[],char pre[])

{

int len,flag;

len=strlen(str1);

int check=0,cnt=len-1,pos=0;

char elem;



while(cnt>=0)  /*while condition*/

{

flag=0;

if(isoperand(str1[cnt]))   /*Checking for Operand*/

{

printf("%c",str1[cnt]);

cnt--;

pos++;

}

else

{

check=prcd(str1[cnt]);

while(check==false)

{

pre[pos]=str1[cnt];

flag=1;

pos++;

cnt--;

}

if(flag==0)

{

elem=pop(&s1);

printf("%c",elem);

}

}



}

}



/**************************************************/

/*To Convert Infix To Postfix*/

/**************************************************/

void intopost(STK s1,char str1[],char post[])

{

int len;

len=strlen(str1);

int check=0,cnt=len-1,pos=0;



}



/**************************************************/

/*To Check For Operand*/

/**************************************************/

int isoperand(char sym)

{

if('A'return(true);

return(false);

}



/**************************************************/

/*To Check The Precedence*/

/**************************************************/

int prcd(char sym)

{



}



/**************************************************/

/*To Display String*/

/**************************************************/

void dis(char str[])

{





}



/******************************************/

/*Push Function Definition*/

/******************************************/

void push(STK *s1,char elem)

{

if(!full(s1))

{

s1->top++;                  /*Incrementing top*/

s1->data[s1->top]=elem;     /*Storing element*/

}

else

printf("

Stack is Full!");

}



/******************************************/

/*Full Function Definition*/

/******************************************/

int full(STK *s2)

{

if(s2->top==MAX)    /*Condition for Full*/

return(true);

return(false);

}



/******************************************/

/*Pop Function Definition*/

/******************************************/

int pop(STK *s1)

{

char elem;

if(!empty(s1))

{

elem=s1->data[s1->top]; /*Storing top stack element in elem*/

s1->top--;              /*Decrementing top*/

return(elem);

}

return(false);

}



/******************************************/

/*Empty Function Definition*/

/******************************************/

int empty(STK *s2)

{

if(s2->top==-1)         /*Condition For Empty*/

return(true);

return(false);

}
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Program to Blinking Lights on Keyboard in c 


#include
void interrupt mytimer();
void interrupt (*prev)();
int run=0,lt=0,ticks=0;
char far *mode;
int temp;
void main()
{
mode=(char far*)0x417;
prev=getvect(0x8);
setvect(0x8,mytimer);
keep(0,100);
getch();
}
void interrupt mytimer()
{
if(run==0)
{
ticks++;
if(ticks==5)
{
ticks=0;
run=1;
lt++;
if(lt==1)
{
temp=*mode;
temp=temp&0x8f;
temp=temp|0x40;
*mode=temp;
}
else if(lt==2)
{
temp=*mode;
temp=temp&0x8f;
temp=temp|0x20;
*mode=temp;
}
else if(lt==3)
{
temp=*mode;
temp=temp&0x8f;
temp=temp|0x10;
*mode=temp;
lt=0;
}
}
run=0;
}
(*prev)();
}


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