Error occur in programming C++ language

[Clement Lo]

I am beginner in C++ language programming and using Microsoft Visual 2010.

The simple code I wrote myself as follow:

// Hello world.cpp : main project file.

#include "stdafx.h"

#include "iostream"

using namespace System;

int main(array<System::String ^> ^args)
{
    //define variables
	float num1;
	float num2;
	float total;

	//enter data for variables
    std::cout << "Enter a value for a first variable: ";
	std::cin >> num1;
	std::cout << "Enter a value for a second variable: ";
	std::cin >> num2;

	//add two numbers together
	total= num1 + num2;

	//display the results
	cout << "The sum of the variables =" <<total << endl;
}

I got error message as below. Can anyone help me?

1>------ Build started: Project: Hello world, Configuration: Debug Win32 ------
1> Hello world.cpp
1>Hello world.cpp(26): error C2065: 'cout' : undeclared identifier
1>Hello world.cpp(26): error C2065: 'endl' : undeclared identifier
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

[weaknessforcats]

//display the results
cout << "The sum of the variables =" <<total << endl;

You forgot the std:: in this line of code.

[Clement Lo]

I added std:: But there is another error message popped up.

#include <iostream>
using namespace std;

#include <math.h>

int main(void)
{
	//define variables
	float num1;
	float num2;

	//enter data for the variables
	std::cout << "Enter a value for the first variable: ";
	std::cin >> num1;
	std::cout << "Enter a value for the second variable: ";
	std::cin >> num2;

	//Add the two number together
	std::equal = num1 + num2;

	//Display the result
	std::cout << "The sum of the number=" << total;
}

1>------ Build started: Project: First project, Configuration: Debug Win32 ------
1> main.cpp
1>c:\users\jhu n yan lo\documents\vi sual studio 2010\projects\f irst project\first project\main.cp p(19): error C2659: '=' : function as left operand
1>c:\users\jhu n yan lo\documents\vi sual studio 2010\projects\f irst project\first project\main.cp p(22): error C2065: 'total' : undeclared identifier
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Please advise.

Thank you.

[weaknessforcats]

//Add the two number together
std::equal = num1 + num2;

//Display the result
std::cout << "The sum of the number=" << total;

What is std::equal?

And where do your define "total"?