a simple function using all ANSI-standard functions to determine the size of a file

#include 

long flength(char *fname)
{
      FILE *fptr;
      long length = -1L;

      fptr = fopen(fname, "rb");
      if(fptr != NULL)
      {
            fseek(fptr, 0L, SEEK_END);
            length = ftell(fptr);
            fclose(fptr);
      }

      return length;
}

#ifdef TEST

main(int argc, char *argv[])
{
      printf("Length of %s = %ld\n", argv[0], flength(argv[0]));
      return 0;
}

#endif /* TEST */

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Program to masking the given set of numbers.

 

#include 
int main()
{
char mask;
char number[6];
char and, or, xor, inv, index;
   number[0] = 0X00;
   number[1] = 0X11;
   number[2] = 0X22;
   number[3] = 0X44;
   number[4] = 0X88;
   number[5] = 0XFF;

   printf(" nmbr  mask   and    or   xor   inv\n");
   mask = 0X0F;
   for (index = 0 ; index <= 5 ; index++) 
   {
      and = mask & number[index];
      or = mask | number[index];
      xor = mask ^ number[index];
      inv = ~number[index];
      printf("%5x %5x %5x %5x %5x %5x\n", 
              number[index], mask, and, or, xor, inv);
   }

   printf("\n");
   mask = 0X22;
   for (index = 0 ; index <= 5 ; index++) 
   {
      and = mask & number[index];
      or = mask | number[index];
      xor = mask ^ number[index];
      inv = ~number[index];
      printf("%5x %5x %5x %5x %5x %5x\n",
                       number[index], mask, and, or, xor, inv);
   }

   return 0;
}



/* OUTPUT of Program

  nmbr  mask   and    or   xor   inv
     0     f     0     f     f  ffff
    11     f     1    1f    1e  ffee
    22     f     2    2f    2d  ffdd
    44     f     4    4f    4b  ffbb
  ff88     f     8  ff8f  ff87    77
  ffff     f     f  ffff  fff0     0

     0    22     0    22    22  ffff
    11    22     0    33    33  ffee
    22    22    22    22     0  ffdd
    44    22     0    66    66  ffbb
  ff88    22     0  ffaa  ffaa    77
  ffff    22    22  ffff  ffdd     0

*/
   

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Program to create dynamic structures using malloc

 
#include 
#include 
#include 

struct animal 
{
   char name[25];
   char breed[25];
   int  age;
} *pet[12], *point;   /* this defines 13 pointers, no variables    */


int main()
{
int index;

      /* first, fill the dynamic structures with nonsense          */
for (index = 0 ; index < 12 ; index++) 
   {
      pet[index] = (struct animal *)malloc(sizeof(struct animal));
      if (pet[index] == NULL)
      {
         printf("Memory allocation failed\n");
         exit (EXIT_FAILURE);
      }

      strcpy(pet[index]->name, "General");
      strcpy(pet[index]->breed, "Mixed Breed");
      pet[index]->age = 4;
}

   pet[4]->age = 12;           /* these lines are simply to        */
   pet[5]->age = 15;           /*      put some nonsense data into */
   pet[6]->age = 10;           /*            a few of the fields.  */

       /* now print out the data described above                   */

   for (index = 0 ; index < 12 ; index++) 
   {
      point = pet[index];
      printf("%s is a %s, and is %d years old.\n", 
                              point->name, point->breed, point->age);
   }

       /* good programming practice dictates that we free up the   */
       /* dynamically allocated space before we quit.              */

   for (index = 0 ; index < 12 ; index++)
      free(pet[index]);

   return EXIT_SUCCESS;
}



/* OUTPUT

General is a Mixed Breed, and is 4 years old.
General is a Mixed Breed, and is 4 years old.
General is a Mixed Breed, and is 4 years old.
General is a Mixed Breed, and is 4 years old.
General is a Mixed Breed, and is 12 years old.
General is a Mixed Breed, and is 15 years old.
General is a Mixed Breed, and is 10 years old.
General is a Mixed Breed, and is 4 years old.
General is a Mixed Breed, and is 4 years old.
General is a Mixed Breed, and is 4 years old.
General is a Mixed Breed, and is 4 years old.
General is a Mixed Breed, and is 4 years old.

*/
   

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