Program in C to print series from 20 to 1

Write a program in C to print series from 20 to 1

#include <stdio.h>

void main ()

{

          int a;

          clrscr ();

          a=20;

          while (a>=1)

          {

                   printf ("\n%d",a);

                   a--;

          }

          getch ();

}