I am writing a program and this error crashes:

error C2065: 'cout': undeclared identifier;

What could be the reason?

Here is the program:

#include <iostream> using namespace std; #include "stdafx.h" void main() { int a, b ; cout << "Enter f-st n-bre" ; cin >> a ; cout << "second"; cin >> b ; cout << "sum is " << a+b << '\n'; }
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1 answer 1

The header that is used for precompiled headers in Visual Studio should always be the first line in the file it is included in. This requirement appeared because everything that goes before this inclusion is ignored.

Therefore, to solve your problem, you need to make #include "stdafx.h" first line in the file.