/*
 * Gets and returns a valid fraction as its result
 * A valid fraction is of this form: integer/positive integer
 */

#include <stdio.h> 

void
scan_fraction(int *nump, int *denomp)
{
      char slash; 
      int  status, error; 
      char discard;  

      do {
          error = 0;
          printf("Enter a fraction as two integers separated by a slash > ");

	  status = scanf("%d%c%d",nump,&slash,denomp); 

             /* status indicating number of valid values obtained */
          if (status < 3) {
              error = 1;
              printf("Invalid-please read directions carefully\n"); 
          } else if (slash != '/') {
             error = 1;
             printf("Invalid-separate numerator and denominator\n"); 
             printf("by a slash (/)\n");
          } else if (*denomp <= 0) {
                error = 1;
                printf("Invalid-denominator must be positive\n");
          }

          /* Discard extra input characters 	*/
          do {
              scanf("%c", &discard);
          } while (discard != '\n');

      } while (error);
}