Changing C++ output without changing the main() function [closed]

Answer 1

We can do it like this too:

#include <iostream>
#include <cstdlib>
using namespace std;

int fnfoo(int inum){
   cout << "I Love You" << endl;
   return (exit(0),inum);
}

int dummy = fnfoo(5);

int main()
{
   cout << "Love" << endl;
}

Simple and works perfectly ;)

Answer 2

Not as elegant as litb's, but it works

#include <iostream> 
#include <cstdio> 
#include <sstream> 

#define cout     printf("I love you\n"); std::ostringstream os; os 

int main() 
{ 
    cout << "love"; 
}

Of course, you don't need to use a stringstream, you could use any class with operator<<.

Answer 3

Assuming this was a class assignment, I would bet the idea was that you could rewrite iostream.h, since C++ doesn't treat it as special (for certain definitions of "special").

Answer 4

Can you be a little more precise?

You want the output of that piece of code to be "I love you" instead of "Love"?

Edit: I don't think you can't without changing at least one line of code in main(). You can either change from cout<<"Love" to cout<<"I love you" or just add a function that outputs that specific line.

Answer 5

Not as elegant as litb's, but an alternative:

#include <iostream>
using namespace std;

int foo()
{
    cout << "I Love You" << endl;
    return cout.rdbuf(0);
}
int i = foo();

int main()
{
    cout << "Love" << endl;
}

Answer 6

I guess you could write an operator<< that added "I" before and "You" after the current output.