#include <stdio.h>
 #include <conio.h>
 void main ()
{
  int a, no, x, sub = 99;
  clrscr ();
  printf (“\n How many num for compute ==>”);
  scanf (“%d”, &no);
     a = no;

  do
         {
printf (“\n Input no #%d ==>”,n);
  scanf (“%d”, &x);
  sub = sub – x;
  no --;
         } while (no > 0);
  printf (“\n Subtraction of %d number = %d, a, sub);
  getch ();
 }

#include <stdio.h>
 #include <conio.h>
 void main ()
{
  {
  int x, sum;
  sum = 1;
  clrscr ();

  do
 {
  printf (“\n Input number for summation [stop type0]=>”);
  scanf (“%d”, &x);
                                  sum=sum+x;
     } while (นิพจน์เงื่อนไข);
  printf (“\n Answer = %d”, sum);
  getch ();
 }