please explain output

Question

Hi

#include <iostream>
using namespace std;

int main()
{
int x = 8;
do
{
cout << x;
}while(!-2);
while(0);

return 0;
}

I am getting output as 8....How? Specially what is syntax of !-2 in while loop.

Answer 1

Ketan Lalcheta

Do while loop execute atleast once so output is 8

!-2 is not a syntax, as like !true and !false it's !-2

here !-2 returns 0

so it's

do {
cout << x;
} while (0);