Catching errors such as divide by zero and typing non-numeric characters

Question

Fellows: How do I extend following script to catch errors such as divide by zero and typing non-numeric characters.      Thanks
This program takes two integers (whole numbers), then displays the sum, average, division,
Modula of those numbers and finally the first number raised to the power of the second number.
import java.io.*;
public class HWOne
     public static void main(String[] args) throws IOException  // error handling
          // variable declaration
          String firstdigit, seconddigit;
          int first, second, sum, total, modus, power;
          float division;
          double average;
          BufferedReader myIn = new BufferedReader(new InputStreamReader(System.in));
          //Invoke user response
          System.out.print("Please enter first digit ");
               firstdigit = myIn.readLine();
               first = Integer.parseInt(firstdigit);
          System.out.print("Please enter second digit ");
               seconddigit = myIn.readLine();
               second = Integer.parseInt(seconddigit);
          //computations
          sum = first + second;
          average = (double)sum / (double)2;
          division = (float)first / (float)second;
          modus = first % second;
          power = (int)Math.pow(first, second);
          //Screen message
          System.out.println("Sum: " + sum);
          System.out.println("Average: " + average);
          System.out.println("Division: " + division);
          System.out.println("Modula: " + modus);
          System.out.println("Power: " + power);

Answer 1

Have you learnt about try/catch statements yet?
The parseInt method throws a NumberFormatException. So you place the call to that method inside a try statement and catch the exception.
For divide by zero, you can use an if statement. If the divisor != 0 perform division.