Execution of a loop an unknown number of times

/* Execution of a loop an unknown number of times */

#include<stdio.h>
#include<conio.h>
main( )
{
 char  another ;
 int  num ;
 do
 {
  printf ( "Enter a number " ) ;
  scanf ( "%d", &num ) ;
  printf ( "square of %d is %d", num, num * num ) ;
  printf ( "\nWant to enter another number y/n " ) ;
  scanf ( " %c", &another ) ;
 } while ( another == 'y' ) ;
 getch();
}