Menu Based Function Overloading Program To Display Area

BlueJ program on function overloading. Function overloading is one type of polymorphism.

Define a class TraingleArea that contains the overloaded area methods – one accepts the length and breadth of a triangle as parameter. The other area method accepts the three sides of a triangle.

The two formulas of computing the area are:

Area1 = ½*base*height

Area2 = Square Root of s(s-a)*s(s-b)*s(s-c)

Where s=(a+b+c)/2 and a,b,c are three sides

import java.util.*;

class TraingleArea

{

Scanner sc=new Scanner(System.in);

public void takeDatas()

{

    int choice, a,b,c,base,height;

    double area1;

System.out.print("\nEnter Choice (1 for Area1 and 2 for Area2):");

choice=sc.nextInt();

switch(choice)

{

     case 1:

            System.out.print("\nEnter Base:");

            base=sc.nextInt();

            System.out.print("\nEnter Height:");

            height=sc.nextInt();

            area1=area(base,height);

            System.out.print("\nArea of triangle as per first formula = "+area1);

            break;

           

     case 2:

           System.out.print("\nEnter 1st Side:");

           a=sc.nextInt();

           System.out.print("\nEnter 2nd Side:");

            b=sc.nextInt();

            System.out.print("\nEnter 3rd Side:");

            c=sc.nextInt();

            area1=area(a,b,c);

            System.out.print("\nArea of triangle as per second formula = "+area1);

            break;

     default:

              System.out.print("\nWrong Choice.");

 }

}

 private double area(int a,int b)

 {

      double r;

      r=1/2.0*a*b;

      return r;

  }

 

  private double area(int a,int b,int c)

 {

      double r;

      double s;

      s=(a+b+c)/2.0;

      s=s*(s-a)*s*(s-b)*s*(s-c);

      r=Math.sqrt(s);

      return r;

  }   

   

public static void main(String args[])throws Exception

{

TraingleArea ob=new TraingleArea ();

ob.takeDatas();

}

}

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