Dynamically allocate multidimensional arrays. - C Array

C examples for Array:Multidimensional Arrays

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Introduction

You must declare a pointer that specifies all but the leftmost array dimension.

The following code builds a table of the numbers 1 through 10 raised to their first, second, third, and fourth powers.

Demo Code

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

int pwr(int a, int b);

int main(void)
{
   /* Declare a pointer to an array that has 10
   ints in each row. *///w ww  . j  a v  a2s  .  c  om
   int* p;

   register int i, j;

   /* allocate memory to hold a 4 x 10 array */
   p = (int*)malloc(40 * sizeof(int));

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

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

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

   return 0;
}

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

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

Result


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