How to change the output of printf() in main() ?

Consider the following program. Change the program so that the output of printf is always 10. It is not allowed to change main(). Only fun() can be changed.

void fun() 
{ 
    // Add something here so that the printf in main prints 10 
} 
  
int main() 
{ 
    int i = 10; 
    fun(); 
    i = 20; 
    printf("%d", i); 
    return 0; 
}

We can use Macro Arguments to change the output of printf.

#include <stdio.h> 
  
void fun() 
{ 
   #define printf(x, y) printf(x, 10); 
} 
  
int main() 
{ 
    int i = 10; 
    fun(); 
    i = 20; 
    printf("%d", i); 
    return 0; 
}

Output:

This article is contributed by Abhay Rathi. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above

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