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C Programming Code Examples

C > Pointers Code Examples

Declare a pointer to an array that has 10 ints in each row: allocate memory to hold a 4 x 10 array

Declare a pointer to an array that has 10 ints in each row: allocate memory to hold a 4 x 10 array

#include <stdio.h>
#include <stdlib.h>

int pwr(int a, int b);

int main(void)
{
  int (*p)[10]; 

  register int x, y;

  p = malloc(40 * sizeof(int));

  if(!p) {
    printf("Memory request failed.\n");
    exit(1);
  }

  for(y = 1; y < 11; y++)
    for(x = 1; x < 5; x++) 
        p[ x - 1][y - 1] = pwr(y, x);

  for(y = 1; y < 11; y++) {
    for(x = 1; x < 5; x++) 
        printf("%10d ", p[x-1][y-1]);
    printf("\n");
  }

  return 0;
}

/* Raise an integer to the specified power. */
pwr(int a, int b)
{
  register int  t=1;

  for(; b; b--) t = t*a;
  return t;
}

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