cin 和 cout 运算符错误 C++

Question

I am doing an assignment for school and at school we use codeblocks for our IDE, but I wanted to use visual studio at home. The problem is when I run my program on visual studio I continue to get an operator error on my cin and cout but only before a string. I tried #include and while the error lines went away when I build I get the same error before. I am new to C++ and rather confused any help is appreciated. picture of code below

Answer 1

The #include <string> you tried would be correct.

Your main problem is the #include "stdafx.h" . It's a Precompiled header . Visual studio puts it in by default although it isn't required. It has to be the first include if you use it:

Visual C++ will not compile anything before the #include "stdafx.h" in the source file, unless the compile option /Yu'stdafx.h' is unchecked (by default); it assumes all code in the source up to and including that line is already compiled.

Just put it as the first #include (or get rid of it completely) to fix your issue. Then the rest should start working normally.