Why do I need function for gotoxy and not getche?

Using dev c++ 4

Hello I'm working on a little program for subnetting. Everything works, I just don't understand a particular thing. What I want to do is have the user enter in 15 characters that will be stored in a character array. Now to do this I'm using conio.h both for the gotoxy function and the getche function. I want to stop the input after the 15th character is entered or return is pressed. I'm using gotoxy to place the cursor after the field label such as "IP address: " thats all. This isn't the real program just a test one, but it will illustrate my point.

Code:

#include <iostream.h>
#include <stdlib.h>
#include <stdio.h>
#include <windows.h>
#include "conio.h"
using namespace std;
int i=0;
char ch[3];

void gotoxy(int x, int y) {
COORD c;
  c.X = x - 1;
  c.Y = y - 1;
  SetConsoleCursorPosition (GetStdHandle(STD_OUTPUT_HANDLE), c);
}

int main()
{

gotoxy(0,30);
do {
++i;
ch[i]=getche();
} while (i <= 2);
cout << endl;
cout << ch[0];
cout << ch[1];
cout << ch[2];


      system("PAUSE");
      return 0;
}

I spent a good few hours looking how to get input one character at a time without the need to terminate. Any how, getche() and gotoxy() are conio.h function. what I need to know is why do I need to include the function void gotoxy() and not the int getche()? the getche works on its own apparently????

Rob

Because the real conio.h is a borland header and the Dev-C++ version doesn't include the gotoxy() function. In any event, conio.h should be in the same directory as your standard headers and as such should be included between angle brackets <conio.h>

Secondly, you're using the std namespace, but none of your headers are under that namespace. Either declare your standard headers as

<iostream>
<cstdlib>
<cstdio>

or don't use that namespace. There no reason to have it the way you do.