4 errors, please indicate errors.

[toseefasim]

#include <iostream.h>
#include <conio.h>
//#include <stdlib.h>

main()
{
void diplay (void);
clrscr();

display();

cout<<"ok";

//getch();

}
void display (void)
{
cout<<"It is my first Function program"<<endl;
}

[simpleasy]

Seems like a homework problem... Why don't you first try for yourself?

[vlad from moscow]

You declared function as

void diplay (void);

But called functiobn
display();

That is their names do not coinside.

I hope that your old compiler allows to omit return types of functions.

Otherwise you shall declare main as

int main()

[mausy131]

You misspelled display in line 7.
Watch this youtube video about functions and please learn some more C++

http://www.youtube.com/watch?v=endPDlcvoYM&list=UUdbHDXYdsHkqpyAt9Z4_iCw&index=4

Fixed code:

#include <iostream>
#include <windows.h>

using namespace std;

void display();       // Function prototyping


int main(){

display();   // You spelled diplay. You don't need to type void. You make a new function if you do that.
                 // What you did is called function overloading. Giving two or more functions the same name. 
                 // So if you want to call a function in main only use the function it's name!

// if you want you can use system("CLS"); here. You must include windows.h for that

cout << "Ok" << endl;

system("PAUSE");
return 0;
}

void display(){
cout << "This is my first function program!" << endl;

}

[toseefasim]

Bundle of Thanks Great work

[mausy131]

You're welcome (: