Question

Write a Java program that prompts user to calculate area of five different shapes using java library, and at least 2 classes - more of OOP, also use divide and conquer methods.

Answer 1

Program:

import java.util.*;

class AreaDemo
{
double areaCircle(double radius)
{
return(Math.PI * Math.pow(radius,2));
}

double areaSphere(double radius)
{
return (4*Math.PI*Math.pow(radius,2));
}

double areaRectangle(double length,double width)
{
return(length * width);
}

double areaCylinder(double radius,double height)
{
return (Math.PI*Math.pow(radius,2)*height);
}

double areaTriangle(double base,double height)
{
return(0.5 * base * height); // 1/2 = 0.5
}
}

class TestArea
{
public static void main(String args[])
{
AreaDemo ad=new AreaDemo();

double radius,len,wid,height,base;

Scanner sc=new Scanner(System.in);
System.out.println("\nMenu Option: ");
System.out.println("---------------------------");
System.out.println("1. Area of Circle");
System.out.println("2. Area of Sphere");
System.out.println("3. Area of Rectangle");
System.out.println("4. Area of Cylinder");
System.out.println("5. Area of Triangle\n");

while(true)
{
System.out.print("\nEnter your choice: ");
int choice=sc.nextInt();

switch(choice)
{
case 1:
System.out.print("\nEnter a radius of a Circle: ");
radius=sc.nextDouble();
System.out.printf("\nArea of Circle: %.2f\n",ad.areaCircle(radius));
break;

case 2:
System.out.print("\nEnter a radius of a Sphere: ");
radius=sc.nextDouble();
System.out.printf("\nArea of Sphere: %.2f\n",ad.areaSphere(radius));
break;

case 3:
System.out.print("\nEnter a length of a Rectangle: ");
len=sc.nextDouble();
System.out.print("Enter a width of a Rectangle: ");
wid=sc.nextDouble();
System.out.printf("\nArea of Reactangle: %.2f\n",ad.areaRectangle(len,wid));
break;

case 4:
System.out.print("\nEnter a radius of Cylinder: ");
radius=sc.nextDouble();
System.out.print("Enter a height of a Cylinder: ");
height=sc.nextDouble();
System.out.printf("\nArea of Cylinder:%.2f ",ad.areaCylinder(radius,height));
break;

case 5:
System.out.print("\nEnter a base of a Triangle: ");
base=sc.nextDouble();
System.out.print("Enter a height of a Triangle: ");
height=sc.nextDouble();
System.out.printf("\nArea of Triangle: %.2f\n",ad.areaTriangle(base,height));
break;

default:
System.out.println("\nInvalid option!!\n");
break;
}
System.out.print("\nDo you want to continue(yes/no): ");
String yesNo=sc.next();
if(yesNo.equalsIgnoreCase("no"))
{
break;
}
}
}
}

Output: