Java Program to Compute a2-b2 where Value of a and b are Given

Java Program to Compute a2-b2 where Value of a and b are Given

by

In the previous article we have discussed Java Program to Compute a2+b2 where Value of a and b are Given

In this program we are going to see how to compute a2-b2   where value of a and b are given by using Java programming language.

Java Program to Compute a2-b2 where Value of a and b are Given

The formula of a2-b2 is given below.

a2-b2  = (a + b)(a – b) = a2 – ab + ab – b2

Now we will convert this into a valid Java expression.

Let x= a2+b2   

=  (a + b)(a – b)

= a2 – ab + ab – b2

=(a*a)-(a*b)+(a*b)-(b*b)

Example:

Suppose a=4 and b=2

Then
a2-b2 
= (a+b)*(a-b)=(a*a)-(a*b)+(a*b)-(b*b)
= (4*4)-(4*2)+(4*2)-(2*2)
=12

Now let’s see different ways to compute a2-b2  

Method-1: Java Program to Compute a2-b2 where Value of a and b are Given By Using Static Input Value

Approach:

  • Declare and initialize two integer variables say a and b.
  • By using the formula compute a2-b2 .
  • Print the result.

Program:

class Main
{
    public static void main(String[] args)
    {
        //declare the first integer variable with an integer value
        int a= 4;
        System.out.println("a= " +a);
        //declare the second integer variable with an integer value
        int b= 2;
        System.out.println("b= "+b);
        //declare another integer variable and assigned the formulated value to it.
        int c=(a*a)-(a*b)+(a*b)-(b*b);
        System.out.println("a2-b2= "+c);
    }
}

Output:

a= 4
b= 2
a2-b2= 12

Method-2: Java Program to Compute a2-b2 where Value of a and b are Given By Using User Input Value

Approach:

  • Declare two integer variables say a and b.
  • Take the value of a and b as user input by using Scanner class.
  • Then By using the formula compute a2-b2 .
  • Print the result

Program:

import java.util.Scanner;
class Main
{
    public static void main(String[] args)
    {
        //create object of scanner class.
        Scanner sc=new Scanner(System.in);
        System.out.print("a= ");
        //Take the first input from the user.
        int a= sc.nextInt();
        System.out.print("b= ");
        //Take the second input from the user.
        int b= sc.nextInt();
        //declare another integer variable and assigned the formulated value to it.
        int c=(a*a)-(a*b)+(a*b)-(b*b);
        System.out.println("a2-b2= "+c);
    }
}

Output:

a= 4
b= 5
a2-b2= -9

Method-3: Java Program to Compute a2-b2 where Value of a and b are Given By Using User Defined Method

Approach:

  • Declare two integer variables say a and b.
  • Take the value of a and b as user input by using Scanner class.
  • Then call a user defined method say computeValue() and pass a and b as parameter.
  • Then inside method by using the formula compute a2-b2 .
  • Print the result.

Program:

import java.util.Scanner;
class Main
{
    public static void main(String[] args)
    {
        //create object of scanner class.
        Scanner sc=new Scanner(System.in);
        System.out.print("a= ");
        //Take the first input from the user.
        int a= sc.nextInt();
        System.out.print("b= ");
        //Take the second input from the user.
        int b= sc.nextInt();
        //call the function
        computeValue(a,b);
    }
    //define the method
    public static void computeValue(int a, int b)
    {
        //declare another integer variable and assigned the formulated value to it.
        int c=(a*a)-(a*b)+(a*b)-(b*b);
        System.out.println("a2-b2= "+c);
    }
}

Output:

a= 8
b= 10
a2-b2= -36

Are you wondering how to seek help from subject matter experts and learn the Java language? Go with these Basic Java Programming Examples and try to code all of them on your own then check with the exact code provided by expert programmers.

Related Java Programs: