#include
main()
{
printf ("%*d\n", 5, 20); // A
printf ("%*d\n", 20, 5); // B
}
20
5
In A, 5 is substituted for * and it indicates putting the value 20 in 5 columns.
In B, 20 is substituted for * and it indicates putting the value 5 in 20 columns.