try yourself |run program

#include <stdio.h> 
#include <conio.h> 
void main(){
 int i;
 clrscr();
 printf("\n This is a while() loop statement program.");
 i=1;
 while(i<10){
 printf("\n %d HELLO WORLD",i);
 i++; /* you can write like this i= i + 1; */
 }
 getch();
}

Program Output

This is a while() loop statement program.
1 HELLO WORLD
2 HELLO WORLD
3 HELLO WORLD
4 HELLO WORLD
5 HELLO WORLD
6 HELLO WORLD
7 HELLO WORLD
8 HELLO WORLD
9 HELLO WORLD