25. Create a new Java program called Calculator.java. Create a new class and main method public static void main(String[] args) Now create three variables that stand for the two numbers that are calculated and the arithmetic symbol. In its first form, our calculator should only be able to calculate two numbers + or -. Think about which variable types you want to use. Create a variable as follows: type name = optional-seed; Using an if query, ask which arithmetic operation the calculator should use and then output the solution on the command line. Since using hard-coded values in source code isn't really appropriate for a user who doesn't want to constantly recompile the program, let's use the command-line parameters to specify the calculation to be performed. If you start your program as follows java Calculator , and the other specified parameters are passed to the program. In your main method you will find the list of strings (the string array) args. You can access the individual values like this: type variablename = args[0] . The previous line takes the first value from the list of command line parameters and stores it in a new variable. Now read in all three parameters and let the calculator calculate the solution to your query. Please note that type conversions may be necessary. For the following task, create the Calculator2.java file. Expand your program with the calculation methods * and /. Now use a switch-case block instead of an if statement to distinguish the arithmetic operation.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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25.

Create a new Java program called Calculator.java.

Create a new class and main method public static void main(String[] args)

Now create three variables that stand for the two numbers that are calculated and the arithmetic symbol. In its first form, our calculator should only be able to calculate two numbers + or -. Think about which variable types you want to use. Create a variable as follows:

type name = optional-seed;

Using an if query, ask which arithmetic operation the calculator should use and then output the solution on the command line.

Since using hard-coded values in source code isn't really appropriate for a user who doesn't want to constantly recompile the program, let's use the command-line parameters to specify the calculation to be performed. If you start your program as follows

java Calculator <firstnumber> <arithmetic operation> <secondnumber> ,

<first number> and the other specified parameters are passed to the program. In your main method you will find the list of strings (the string array) args. You can access the individual values like this: type variablename = args[0] . The previous line takes the first value from the list of command line parameters and stores it in a new variable. Now read in all three parameters and let the calculator calculate the solution to your query. Please note that type conversions may be necessary.

For the following task, create the Calculator2.java file. Expand your program with the calculation methods * and /. Now use a switch-case block instead of an if statement to distinguish the arithmetic operation.

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