#include <stdio.h>

int  main (void)
{
   /* declarations */
   int a;
   double x;
   
   /* executable statements */
   a = 1000;
   x = 100.987654321;

   printf ("%d\n", a);
   printf ("%4d\n", a);
   printf ("%5d\n", a);
   printf ("%7d\n", a);

   printf ("\n");

   printf ("%lf\n", x);
   printf ("%15lf\n", x);
   printf ("%15.4lf\n", x);
   printf ("%18.2lf\n", x);
   printf("Width 1 and 2 are too short for 100, but the number is printed with rounding\n");
   printf ("%.0lf\n", x);
   printf ("%1.0lf\n", x);
   printf ("%2.0lf\n", x);
   printf ("%2.1lf\n", x);
   printf ("%2.2lf\n", x);
   printf ("%2.3lf\n", x);
   printf ("%2.4lf\n", x);
   printf ("%2.5lf\n", x);
   printf ("%2.7lf\n", x);

   return (0);
}

/* Output:
1000
1000
 1000
   1000

100.987654
     100.987654
       100.9877
            100.99
Width 1 and 2 are too short for 100, but the number is printed with rounding
101
101
101
101.0
100.99
100.988
100.9877
100.98765
100.9876543
*/