/*
 * Gets and returns a valid arithmetic operator.  Skips over newline
 * characters and permits re-entry of operator in case of error.
 */

#include <stdio.h> 

char
get_operator(void) 
{
      char op;

      printf("Enter an arithmetic operator (+,-,*, or /)> ");
      for ( scanf("%c", &op); 
            op != '+'  &&  op != '-'  && op != '*'  &&  op != '/';
            scanf("%c", &op) ) 
      {
          if (op != '\n')
              printf("%c invalid, reenter operator (+,-, *,/)> ", op);
      }
      return (op);
}