Sololearn coders should sharpen their knowledge. What should be the output? Sololearn says it's 20. Do you agree with them?

Question

#include<iostream>
using namespace std;

int main()
{
int x = 10, s = 0;
s = sizeof(x = x+20);
cout << x << endl;
return 0;
}

Answer 1

The answer should be 10. Explanation: the sizeof operator is evaluated at compile time. The compiler only needs to determine the type of the result in order to substitute the size as a literal constant, so only the left side of the assignment (=) matters, which is x, so the compiler substitutes 4 as the sizeof (int). It ignores the right side and it does not build the assignment into the run-time code.

If Sololearn claims the answer is 20 or even 30, then you should send a bug report to [e-mail]. The output is 10.

Where did you find this, Md Mehedi Hasan?

Answer 2

Md Mehedi Hasan ,

do you have a coding related question / issue with your code? or is it just a quizz?