c ++ Programming - 1 - c++ Programming - 1 : cin / cout

First quick application covering why you may get iostream, cin and cout errors.
Programming code provided below:

Copy the following codes into the header file: -
stdafx.h:

// stdafx.h : include file for standard system include files,
// or project specific include files that are used frequently, but
// are changed infrequently
//

#pragma once


#include 
#include 
using namespace std;

// TODO: reference additional headers your program requires here

Copy the main code for the main file:
3_test.cpp But you can name your file anything. Below is the rest of the programming codes:

// 3_test.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"

//Percentage marks attained by a student in three exams
//are to be entered to a computer. An indication of Pass
//or Fail is given out after the three marks are entered.
//The criteria for passing are as follows:

//A student passes if all three examinations are passed.
//Additional a student may pass if only one subjects is
//failed and the overall average is greater than or equal
//to 50. The pass mark for an individual subject is 40.

#include 

void main()

{

float i, x, y, av;


cout<<"Enter percentage mark for 1st exam (40=pass,10=fail):";

cin>>i;

cout<<"\n\nEnter percentage mark for 2nd exam:";

cin>>x;

cout<<"\n\nEnter percentage mark for 3rd exam:";

cin>>y;

  av=(i+x+y/3);

 if (av>=50)

 {

   cout<<"\n\nCongratulations\t"<<"you have pass the test!.";

 }

 else

   cout<<"\n\nYou have failed\t"<<"better luck next time!.";
 
    system("PAUSE");
  //return(0);


}

Check the video on how this works on YouTube here:
http://youtu.be/xSYHLfQOnak