After catching the exception thrown

[scoobyrox]

Part of my school assignment is asking us to throw an exception if the answer is zero or less than zero. After catching the exception, I would like to re-ask the same question. I tried adding the same question after the catch statement but if I enter zero, it does not re-ask the same question.

My code is below.

try {

System.out.print("Enter tutored time in minutes: ");
matrix[i][0] = input.nextDouble();

if (matrix[i][0] <= 0);
throw new ArithmeticException("Minutes must be greater than zero");

}
catch (ArithmeticException ex) {
System.out.println("Minutes must be greater than 0");
}

/* if I add the following statements here to re-ask the same question:
**System.out.print("Enter tutored time in minutes: ");
**matrix[i][0] = input.nextDouble();
**it will not re-ask the same question if the answer is zero again */

[JosAH]

Part of my school assignment is asking us to throw an exception if the answer is zero or less than zero. After catching the exception, I would like to re-ask the same question. I tried adding the same question after the catch statement but if I enter zero, it does not re-ask the same question.

Your code begs for a while loop; a while loop with a try-catch block in its body. If the loop ends a positive number was given by the user. If I were you I'd stick all that code in a separate method that only returns correct (positive) answers given by the user; it handles those try-catch blocks itself. A skeleton of the code could be:

int getAnswer() {
   int ans= -1;
   while (ans < 0) { //  as long as no correct answer given ...
      try {   
         ans= ...; // get answer from the user;
         if (ans < 0)
            throw ArithmeticException("incorrect anser:"+ans);
        return ans; // pass back a correct answer
      }
      catch (ArithmeticException ae) {
         System.out.println(ae.getMessage());
      }
   }
   return -1; // never reached
}

kind regards,

Jos

[scoobyrox]

Your code begs for a while loop; a while loop with a try-catch block in its body. If the loop ends a positive number was given by the user. If I were you I'd stick all that code in a separate method that only returns correct (positive) answers given by the user; it handles those try-catch blocks itself. A skeleton of the code could be:

int getAnswer() {
   int ans= -1;
   while (ans < 0) { //  as long as no correct answer given ...
      try {   
         ans= ...; // get answer from the user;
         if (ans < 0)
            throw ArithmeticException("incorrect anser:"+ans);
        return ans; // pass back a correct answer
      }
      catch (ArithmeticException ae) {
         System.out.println(ae.getMessage());
      }
   }
   return -1; // never reached
}

kind regards,

Jos

Thank you. That seems pretty simple. I think I am still not very good in creating algorithm before coding.