Code:
#include<stdio.h>
//Enable first program
#define run1
//Enable second program
//#define run2
//First program
#ifdef run1
int main()
{
printf("I am from main in run1 section");
return 0;
}
#endif
//second Program
#ifdef run2
int main()
{
printf("I am main in run2 section");
return;
}
#endif