/* 
   Program: diag.c

   Using nested for loops to draw
   a diagonal of O's.
*/

#include <stdio.h>
#include "genlib.h"
#include "simpio.h"

main() {
   int i, j ;

   for (i = 1 ; i <= 5 ; ++i ) {
      for (j = 1 ; j <= 5 ; ++j) {
	 if (i == j) {
	    printf("O") ; 
	 } else {
	    printf("*") ;
	 }
      } 
      printf("\n") ;
   }
}
---------------------------------------------

O****
*O***
**O**
***O*
****O