visual studio 2012 error

[miss1001]

Hi there!

1-I'm faced with this error when I used cin and cout instructions
what should I do??

  Error	1	error C2065: 'cin' : undeclared identifier
	c:\users\mahsa\documents\visual studio 2012\projects\prozh\consoleapplication1
\consoleapplication1\source.cpp	11

2-adding to many libraries to my project does it have any affect on my program execution speed?

[48T7M4Gy]

sounds like you didnt #include <iostream> and don't worry too much about the number of libraries, #includes

And if you are using cin and not std::cin then you need using namespace std; too.

[miss1001]

I added

#include<iostream>

but it doesn't make difference

:((((

[48T7M4Gy]

using namespace std;

[miss1001]

what a shameful mistake I made
:/

thank you

[48T7M4Gy]

:)