why this result shows 0?

Question

https://code.sololearn.com/c2H3Vj9Cxzk8/?ref=app

I thought a&&a is true, so result will be 1.
but it wasn't. Why it shows 0, instead of 1?

#include <iostream>
using namespace std;

int main() {
int a=0;
cout << (a&&a);
return 0;
}

Answer 1

a=0 which is false so the next 'a' is not even looked at by the compiler and the whole expression is evaluated to false which is a binary 0.