Why does this if-statement combining assignment and an equality check return true?

Question

I\'ve been thinking of some beginner mistakes and I ended up with the one on the if statement. I expanded a bit the code to this:

int i = 0;
if          


        

Answer 1

Assuming your code actually looks like this:

#include 
using namespace std;

int main()  {
    int i = 0;
    if (i = 1 && i == 0) {
        cout << i;
    }
}

Then this:

if (i = 1 && i == 0) {

evaluates as

 if (i = (1 && i == 0)) {

and so i is set to 1.