Program to find product of two no using MACRO

/*Serial No.99     [swami74.cpp]*/

#include<stdio.h>

#include<conio.h>

#define prod(t,r) t*r

void main()

{

int a,b,c;

printf("enter two no. for finding product\n");

scanf("%d%d",&a,&b);

c=prod(a,b);

printf("%d",c);

getch();

}