Waiting thread in C:

#include<dos.h>
#include<conio.h>
#include<stdio.h>
void main()
{
int i=0;
clrscr();
printf("Look at number: ");
for(i=0;i<=100;i++)
{
gotoxy(20,1);
printf("%d",i);
delay(50);
}
getch();
}