Exercises Java with Examples-
Practice Exercises Java 4,5 5 302940

Calculator, params and return value of Main - Practice Exercises Java


Lesson 5:

Functions


Exercise 5.32:

Calculator, params and return value of Main


Objetive:

Create a program to calculate a sum, subtraction, product or division, analyzing the command line parameters:

calc 5 + 379

(Parameters must be a number, a sign, and another number; allowed signs are + - * x / )

This version must return the following error codes:
1 if the number of parameters is not 3
2 if the second parameter is not an accepted sign
3 if the first or third parameter is not a valid number
0 otherwise


Source Code:


public class Main
{
	public static int main(String[] args)
	{
		if (args.length != 3)
		{
			System.out.println("Error!");
			System.out.println("Usage: number1 operand number2");
			System.out.println("Where operand can be + - / * x ·");
			return 1;
		}

		try
		{
			int number1 = Integer.parseInt(args[0]);
			int number2 = Integer.parseInt(args[2]);

			switch (args[1])
			{
				case "+":
				{
						System.out.println(number1 + number2);
						break;
				}

				case "-":
				{
						System.out.println(number1 - number2);
						break;
				}

				case "/":
				{
						System.out.println(number1 / number2);
						break;
				}

				case "*":
				case "x":
				case "·":
				{
						System.out.println(number1 * number2);
						break;
				}

				default:
				{
						System.out.println("Error!");
						System.out.println("Operand must be + - / * x or ·");
						return 2;
						break;
				}
			}
		}

		catch (RuntimeException e)
		{
			System.out.println("Error!");
			System.out.println("Not a valid number");
			return 3;
		}

		return 0;
	}
}
Exercisey 5.32

Share Now:


Google Ads





Privacy Policy:



Google uses associated advertising companies to serve ads when it visits our website. These companies may use the information they obtain from your visits to this and other websites (not including your name, address, email address, or phone number) to provide you with announcements about products and services that interest you. If you would like to learn more about this practice and know your options to prevent these companies from using this information. Click in... Privacy and Terms of Google.

Cookies

This site uses Google cookies to provide its services, to personalize advertisements and to analyze traffic. Google receives information about your use of this website. More information in... Privacy and Terms of Google.