Question

Build a Java class file to calculate the area of a figure (call it Area.java). The figure may be a circle or a square or a rectangle. The user will enter the type of figure they want through a Scanner. It they enter “C”, proceed to calculate the area of a Circle using values read in for radius. If they enter an “S”, then calculate the area of the circle using values read in for side. If they enter an “R”, then calculate using values read in for height and width. Use nested if statements for this lab.

Formulas are:

Circle: Area = 3.14*radius*radius

Square: Area= side*side

Rectangle: Area = Height*Width

3)Modify code for #2 to use the Switch Statements instead of “if” statements to make the decisions.

CIST 2371

Answer 1

Please find the code below with if statements:

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import java.util.Scanner;
public class Area
{   static String ch;
    Scanner sc=new Scanner(System.in);
    public static void main(String[] args) {
   Main ob=new Main();
   ob.input();
   if(ch=="C")
        {
          
            ob.circ();
        }
        if(ch=="S")
        {
            ob.squa();
        }
        if(ch=="R")
        {
            ob.rect();
        }  
      
   }
    void input()
    {
        System.out.println("Enter 'C' to calculate Area of Circle");
        System.out.println("Enter 'S' to calculate Area of Square");
        System.out.println("Enter 'R' to calculate Area of Rectangle");
        ch=sc.nextLine();
       
     
      
    }
    void circ()
    {
        System.out.println("Enter the Radius");
        int r=sc.nextInt();
        double ar1=3.14*r*r;
        System.out.println("Area of circle is :"+ar1);
    }
    void squa()
    {
        System.out.println("Enter the Side");
        int s=sc.nextInt();
        int ar2=s*s;
        System.out.println("Area of Square is :"+ar2);
    }
    void rect()
    {
        System.out.println("Enter the Length");
        int l=sc.nextInt();
        System.out.println("Enter the Breadth");
        int b=sc.nextInt();
        int ar3=l*b;
        System.out.println("Area of Rectangle is :"+ar3);
    }
  
  
}

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Please find the Switch statement code below:
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import java.util.Scanner;
public class Area
{   static String ch;
    Scanner sc=new Scanner(System.in);
    public static void main(String[] args) {
   Main ob=new Main();
   ob.input();
   switch(ch)
   {
   case "C":
        ob.circ();
        break;
     case "S":
            ob.squa();
        break;
     case "R":
            ob.rect();
        break;  
   default:

System.out.println("Wrong choice entered, Re-enter choice");

ob.input();

break;
   }
    }
    void input()
    {
        System.out.println("Enter 'C' to calculate Area of Circle");
        System.out.println("Enter 'S' to calculate Area of Square");
        System.out.println("Enter 'R' to calculate Area of Rectangle");
        ch=sc.nextLine();
       
     
      
    }
    void circ()
    {
        System.out.println("Enter the Radius");
        int r=sc.nextInt();
        double ar1=3.14*r*r;
        System.out.println("Area of circle is :"+ar1);
    }
    void squa()
    {
        System.out.println("Enter the Side");
        int s=sc.nextInt();
        int ar2=s*s;
        System.out.println("Area of Square is :"+ar2);
    }
    void rect()
    {
        System.out.println("Enter the Length");
        int l=sc.nextInt();
        System.out.println("Enter the Breadth");
        int b=sc.nextInt();
        int ar3=l*b;
        System.out.println("Area of Rectangle is :"+ar3);
    }
  
  
}