I'm doing my high school introduction to CS exam review, and I don't understand why this while loop is an infinite loop:

int b = 6;
while (b != 21)
{
    b   3;
    cout << b << " ";
}

Eventually, b will equal 21, so shouldn't it stop the loop?

I tried understanding, but I can't understand this.

CodePudding user response：

You're not updating the value of b inside the loop, so its value is always 6. You need to use an assignment operator to actually set a new value.

So, use b = b 3; or b = 3; instead.