"The system cannot find the specified path" error. C++ How to fix?

Question

C++ / C#

#include <math> // При компиляции не находит этот заголовок.

Answer 1

How to fix this?

https://en.cppreference.com/w/cpp/header/cmath
#include<cmath>

Answer 2

Your program did not build, so the file was not found. Look closely at the compiler output window below, it says

0 - succeeded, 1 - failed

This means a compilation error. Then look at the "error list" window, the specific error(s) will be indicated there.
In this case, the error was already indicated to you by Roman above.