Can Anyone explain why this happens?

Question

I have been making a code for print a square with some functions I have made. Can anyone explain why 5 is printing after the product.

https://code.sololearn.com/cU80To9kZjYG/?ref=app

Answer 1

The function rf returns an integer. When you not return a value it produces undefined behaviour. Seems like the compiler used one sololearn returns either a 1 of nothing gets returned or the last variable used in a for loop, if the for loop has a range that is determined by an given integer argument.
As you can see this behaviour is really strange, and to add complexity to this: another compiler will most likely behave totally different.

You need to change rf to void and call the rf function before you cout << endl.

Answer 2

@Alex and @Timon thanks for the help and I have figured it with both of answers provided by you two.

Answer 3

//not sure, but now it works.

#include <iostream>
using namespace std;
void rf(int x){
for(int y=0;y<x;y++){
cout << "*";
}
}
void yy(int y){
for(int t=0;t<y;t++){
rf(y);
cout << endl;
}
}

int main() {
int a;
cin >> a;
yy(a);
return 0;
}