Visual Studio C++, Identifier not found

Question

This is my code!

#include "stdafx.h"
#include<iostream>
#include<conio.h>
void main()
{
clrscr();
int no;
cout<<"Enter a number";
cin>>no;
getch();
}

and I get this error here!

I think I might have to download some extra visual studio c++ related directories, but still some suggestions please

http://stackoverflow.com/questions/930138/is-clrscr-a-function-in-c — Mohammad, Apr 08 '16 at 16:49
So many bad things. I suggest you get yourself a [good C++ book](http://stackoverflow.com/questions/388242/the-definitive-c-book-guide-and-list) to see how C++ should be coded. — NathanOliver, Apr 08 '16 at 16:49
This code is like a collection of worst practices. Please learn C++ from a better source. — nvoigt, Apr 08 '16 at 16:51
[Somebody's been teaching you Turbo C++](http://stackoverflow.com/a/930141/560648). This question is a perfect example of how that information will not serve you very well in the real world. — Lightness Races in Orbit, Apr 08 '16 at 17:17

Remy Lebeau · Answer 1 · 2016-04-08T17:01:59.570

clrscr() is not a standard function. Visual Studio does not have it. However, MSDN does document how to clear the screen using system("cls"), or FillConsoleOutputCharacter() and FillConsoleOutputAttribute().

As for the cin/cout errors, you need to prefix them with the std:: namespace qualifier, eg std::cin and std::cout, or use a separate using namespace std; statement in your code below the header #include statements.

Try this:

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

void clrscr()
{
    std::system("cls");
}

int main()
{
    clrscr();
    int no;
    std::cout << "Enter a number";
    std::cin >> no;
    getch();
    return 0;
}

Or:

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

using namespace std;

void clrscr()
{
    std::system("cls");
}

int main()
{
    clrscr();
    int no;
    cout << "Enter a number";
    cin >> no;
    getch();
    return 0;
}

score 0 · Answer 2 · answered Apr 08 '16 at 17:14

Right now your c++ program doesn't know what clrscr(); is..

you have to define that function. To define it, see @Remy Lebeau's answer.

One quick solution instead of creating a function to clear out the screen is to simply cout a bunch of blank spaces.

so in your main you can simply put :

std::cout << string(50, '\n');

Visual Studio C++, Identifier not found

2 Answers2