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Help real quick! undeclared identifiers and namespace error

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http://www.daniweb.com – Hello!! I have started learning c++ and it has been a real sucess until now. My codes that worked before and those that im trying to use now, doesn't work.. I get a compiler error... Here is the code and the error: // tutorialearning.cpp : Defines the entry point for the console application. #include <iostream> #include <stdafx.h> int doubleNumber(int x) {         return 2 * x; } int main() {          using namespace std;         cout << "Number to double: " << endl;         cin >> x;         cout << "Doubled number: " << doublenumber(x) << endl;         return 0; } And im getting this in the compiler when i try to build: 1>------ Build started: Project: tutorialearning, Configuration: Debug Win32 ------ 1>Compiling... 1>tutorialearning.cpp 1>d:\c++projects\tutorialearning\tutorialearning\tutorialearning.cpp(4) : warning C4627: '#include <iostream>': skipped when looking for precompiled header use 1>        Add directive to 'stdafx.h' or rebuild precompiled header 1>d:\c++projects\tutorialearning\tutorialearning\tutorialearning.cpp(14) : error C2871: 'std' : a namespace with this name does not exist 1>d:\c++projects\tutorialearning\tutorialearning\tutorialearning.cpp(15) : error C2065: 'cout' : undeclared identifier 1>d:\c++projects\tutorialearning\tutorialearning\tutorialearning.cpp(15) : error C2065: 'endl' : undeclared identifier 1>d:\c++projects\tutorialearning\tutorialearning\tutorialearning.cpp(16) : error C2065: 'cin' : undeclared identifier 1>d:\c++projects\tutorialearning\tutorialearning\tutorialearning.cpp(16) : error C2065: 'x' : undeclared identifier 1>d:\c++projects\tutorialearning\tutorialearning\tutorialearning.cpp(17) : error C2065: 'cout' : undeclared identifier 1>d:\c++projects\tutorialearning\tutorialearning\tutorialearning.cpp(17) : error C2065: 'x' : undeclared identifier 1>d:\c++projects\tutorialearning\tutorialearning\tutorialearning.cpp(17) : error C2065: 'endl' : undeclared identifier 1>d:\c++projects\tutorialearning\tutorialearning\tutorialearning.cpp(17) : error C3861: 'doublenumber': identifier not found 1>Build log was saved at "file://d:\c++projects\tutorialearning\tutorialearning\Debug\BuildLog.htm" 1>tutorialearning - 9 error(s), 1 warning(s) ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== I really appreciate if you help me and such, thank you!! (General)