Question

What is the difference between these two programs?

#include <iostream>

using namespace std;

int DontPanic(int & x);

int z = 10;

void main()

{

char x = 'y';

int y = 5;

int z = 100;

y = DontPanic(z);

cout << x << " " << y << " " << z << endl;

}

int DontPanic(int & x)

{

int * p;

p = & z;

x = (*p)++ + 1;

cout << x << " " << *p << " " << z << endl;

return --z;

}

and

#include <iostream>

using namespace std;

int DontPanic(int & x);

int z = 10;

int main()

{

char x = 'y';

int y = 5;

int z = 100;

y = DontPanic(z);

cout << x << " " << y << " " << z << endl;

}

int DontPanic(int & x)

{

int * p;

p = & z;

x = (*p)++ + 1;

cout << x << " " << *p << " " << z << endl;

return --z;

}

Answer 1

only difference between these program is
in first program return type of main is declared as void.
where as in second program, return type of main is declared as int.

but, There won't be any change in the output.