Question

// please i cant understand why this program isnot running HELP me please?

import java.util.Scanner;

public class String {

public static void main(String[] args) {

double Sside, Rlength, Rwidth, Tbase, Theight, Area, Tarea, Rarea;

String input;

Scanner keyboard = new Scanner(System.in);

System.out.print("To Calculate the are of Square Enter 'Square', For Rectangle Enter 'Rectangle', For Triangle Enter 'Triangle'");

input = keyboard.nextLine();

if (input.equalsIgnoreCase("SQUARE"))

{ System.out.println("Square Side");

Sside = keyboard.nextInt();

Tarea = Sside * Sside;

System.out.println("Side = " + Tarea ); }

else if (input.equalsIgnoreCase ("RECTANGLE"))

{ System.out.println ("Enter Length");

Rlength = keyboard.nextInt();

System.out.println ("Enter Width");

Rwidth = keyboard.nextInt();

Rarea = Rlength * Rwidth;

System.out.println("Triangle Area = " + Rarea); }

else if (input.equalsIgnoreCase ("TRIANGLE"))

{ System.out.println ("Enter Base");

Tbase = keyboard.nextInt();

System.out.println ("Enter Height");

Theight = keyboard.nextInt ();

Area = 0.5 * Tbase * Theight;

System.out.println("The Total Area of Triangle is = " + Area); }

else { System.out.println("Invalid"); }

System.exit(0);

}

}

Answer 1

import java.util.Scanner;

public class StringClass {
    public static void main(String[] args) {
        double Sside, Rlength, Rwidth, Tbase, Theight, Area, Tarea, Rarea;
        String input;
        Scanner keyboard = new Scanner(System.in);
        System.out.print("To Calculate the are of Square Enter 'Square', For Rectangle Enter 'Rectangle', For Triangle Enter 'Triangle'");
        input = keyboard.nextLine();
        if (input.equalsIgnoreCase("SQUARE")) {
            System.out.println("Square Side");
            Sside = keyboard.nextInt();
            Tarea = Sside * Sside;
            System.out.println("Side = " + Tarea);
        } else if (input.equalsIgnoreCase("RECTANGLE")) {
            System.out.println("Enter Length");
            Rlength = keyboard.nextInt();
            System.out.println("Enter Width");
            Rwidth = keyboard.nextInt();
            Rarea = Rlength * Rwidth;
            System.out.println("Triangle Area = " + Rarea);
        } else if (input.equalsIgnoreCase("TRIANGLE")) {
            System.out.println("Enter Base");
            Tbase = keyboard.nextInt();
            System.out.println("Enter Height");
            Theight = keyboard.nextInt();
            Area = 0.5 * Tbase * Theight;
            System.out.println("The Total Area of Triangle is = " + Area);
        } else {
            System.out.println("Invalid");
        }
        System.exit(0);
    }
}