Question

1. Create a program with the Calculator.java code
   1. RUN the program with the invalid data arguments 1, 3, 5x
   2. Take a screenshot of the output and describe what you think happened.
   3. MODIFY the code as in listing 14.2, NewCalculator.java , RUN it again with the same invalid input
   4. Take a screenshot of the new output and describe in your word document why you think the exception handling is a 'better' programming technique than just letting the program crash.

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The Calculator.java code

1: package com.java24hours;
2:
3: public class Calculator {
4: public static void main(String[] arguments) {
5: float sum = 0;
6: for (String argument : arguments) {
7: sum = sum + Float.parseFloat(argument);
8: }
9: System.out.println("Those numbers add up to " + sum);
10: }
11: }

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The NewCalculator.java code

1: package com.java24hours;
2:
3: public class NewCalculator {
4: public static void main(String[] arguments) {
5: float sum = 0;
6: for (String argument : arguments) {
7: try {
8: sum = sum + Float.parseFloat(argument);
9: } catch (NumberFormatException e) {
10: System.out.println(argument + " is not a number.");
11: }
12: }
13: System.out.println("Those numbers add up to " + sum);
14: }
15: }

Answer 1

//if you are satisfied with the answer kindly leave a like, comment to clear doubts

1. In Calculator.java it leads to an error since "5x" cannot be float parsed hence it gives an error. There is no float value corresponding to "5x" like "8" is 8.0 and "1" is 1.0

2. Exception handling is a better programming technique since while deploying applications, it may lead to the application crashing and pausing the whole process of working on the application and leads to bad user experience.

Handling errors leads to a smooth flow of programs.

Screenshot:

Calculator.java:

NewCalculator.java: