Need Help on a program.

[Magicalyak]

Im using an online resource to learn C++. This was a program that they had for loops. I am trying to run it but it keeps failing.

#include "stdafx.h"
#include <iostream>

using namespace System;

int main()
{
  //declaration of variables
int sum, number;
//Initialization of the variables
sum = 0;
number = 1;
// using the while loop to find out the sum of first 1000 integers starting from 1
while(number <= 1000)
{
// Adding the integer to the contents of sum
sum = sum + number;
// Generate the next integer by adding 1 to the integer
number = number + 1;
}
cout << "The sum of first 1000 integers starting from 1 is " << sum;
return 0;
}

and i am getting an error message which is
1>------ Build started: Project: More Training, Configuration: Debug Win32 ------
1> More Training.cpp
1>More Training.cpp(23): error C2065: 'cout' : undeclared identifier
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
please help i don't understand what this error message means.
Thank you very much

[ne555]

cout is in the std namespace not in System

[LB]

1. Don't use VC++'s Console Project, make an Empty Project instead (it doesn't have that evil "stdafx.h" header)
2. The standard libraries put stuff into the std namespace, not the System namespace.

[Moschops]

cout lives in namespace std

Your options are to do one of the following:

1) stick using namesapce std; at the top of your code where right now you have a completely useless using namespace System; which sounds to me like something you'd get in a .NET language of some kind,

2) instead of cout write std::cout

3) stick using std::cout; in your code before you use cout. Again, at the top in place of using namespace System; would work.