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Define function to multiply two int

#include <stdio.h> int mul(int a, int b); int main(void) { int j, k, z; j = 13; k = 23; z = mul(j, k); /* 1 */ printf("%d", mul(j,k)); /* 2 */ mul(j, k); /* 3 */ return 0; } int mul(int a, int b) { return a * b; }