Define function to multiply two int

#include <stdio.h>

int mul(int a, int b);

int main(void) {
  int x, y, z;

  x = 10;   
  y = 20;
  z = mul(x, y);           /* 1 */
  
  printf("%d", mul(x,y));  /* 2 */
  
  mul(x, y);               /* 3 */

  return 0;
}

int mul(int a, int b) {
  return a * b;
}

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Define function to multiply two int : Function « Function « C / ANSI-C

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