Java Program to Add Two Numbers

Write a Java Program to Add Two Numbers and print the output. It is one of the fundamental concepts of calculations, and to achieve the same, we can use the arithmetic operator (+).

The following example shows how we can use the arithmetic operator (+) to add two numbers. Here, we declared two variables and assigned 10 and 50. Next, within the System.out.println() statement, we added the two numbers.

public class example {
	public static void main(String[] args) {
		int a = 10, b = 50;
		System.out.println("Total = " + (a + b));
	}
}

Total = 60

Java Program to Add Two Numbers Example

This simple program lets the user enter two integer values and then add those two numbers using the arithmetic operator (+) and assign them to a variable sum.

package SimpleNumberPrograms;

import java.util.Scanner;

public class addTwoNumbers {

 private static Scanner sc;

 public static void main(String[] args) {
 int Number1, Number2, Sum;
 sc = new Scanner(System.in);
 
 System.out.print("Please Enter the First integer Value: ");
 Number1 = sc.nextInt();

 System.out.print("Please Enter the Second integer Value: ");
 Number2 = sc.nextInt();
 
 Sum = Number1 + Number2;
 System.out.println("\nSum of the two integer values is = " + Sum);
 }
}

Within this Program, we used Java Arithmetic Operators + to add Number1 and Number2 and then assigned that total to Sum.

Sum = Number1 + Number2;

The following Java System.out.println statement will print the sum variable as output (10 + 25 = 35).

System.out.println("\nSum of the two integer values is = " + Sum);

Java Program to Add Two Numbers using Functions

In this Java program, we are using the same steps we followed in our first example. Still, we separated the Add Two Numbers logic and placed it in a separate method.

package SimpleNumberPrograms;

import java.util.Scanner;

public class addTwoNumbersMethod {
	private static Scanner sc;
	
	public static void main(String[] args) {
		
		int Number1, Number2, Sum;
		sc = new Scanner(System.in);
	
		System.out.println("Please Enter the First integer Value: ");
		Number1 = sc.nextInt();
		//System.out.println("Please Enter the Second integer Value: ");
		Number2 = sc.nextInt();
		
		Sum = add(Number1, Number2);
		System.out.println("\nSum of the two integer values is = " + Sum);
	}
	
	public static int add(int Number1,int Number2){
		int Sum;
		Sum = Number1 + Number2;
		return Sum;
	}
}

Output.

If you observe the following statement, we call the add method and assign the return value to the integer variable Sum.

Sum = add(Number1, Number2);

Let us see the code inside the add method.

public static int add(int Number1,int Number2){
		int Sum;
		Sum = Number1 + Number2;
		return Sum;
	}

From the above code snippet, you can observe that this method accepts two integer type arguments.

• We declared an integer variable, Sum, to store the added value within the function.
• Next, we performed the arithmetic operation to add two integer numbers.
• Lastly, we are returning Sum.

Java Program to Add Two Numbers using OOPs

In this example, we are dividing the code further using Object Oriented Programming. First, we will create a class with two methods to do this.

TIP: In general, You don’t have to write the first method. We used this to show the available options.

package SimpleNumberPrograms;

public class AddNumbers {
	int x, y, Sum;
	
	public void add(){
		Sum = x + y;
		System.out.println("\n From Class: Sum of two integer values is = " + Sum);
	}
	
	public int addAgain(int Number1,int Number2){
		Sum = Number1 + Number2;
		return Sum;
	}
}

Within the Main Program to Add Two Numbers, we will create an instance of the above-specified class and call the methods.

// Calling AddNumbers Class
package SimpleNumberPrograms;

import java.util.Scanner;

public class addTwoNumbersClass {
	private static Scanner sc;
	
	public static void main(String[] args) {
		int Number1, Number2, Sum;
		sc = new Scanner(System.in);
	
		System.out.println("\n Please Enter the First integer Value: ");
		Number1 = sc.nextInt();
		System.out.println("\n Please Enter the Second integer Value: ");
		Number2 = sc.nextInt();
		
		AddNumbers addNum = new AddNumbers();
		addNum.x = Number1;
		addNum.y = Number2;
		
		addNum.add();
		Sum = addNum.addAgain(Number1, Number2);
		System.out.println("\n Sum of the two integer values is = " + Sum);
	}

}

Add Two Numbers in AddNumbers Class program Analysis:

• First, we declared a function add with zero arguments. We performed the arithmetic addition within the function and printed the Output using the System.out.println statement.
• Next, we declared an integer function addAgain with two arguments. We performed the arithmetic addition within the function and returned the integer value.

Main Class Analysis:

In the Add Two Numbers main class, First, we created an instance of the AddNumbers Class

AddNumbers addNum = new AddNumbers();

Next, we assign the user-entered values to the AddNumbers Class variables.

addNum.x = Number1;
addNum.y = Number2;

Next, we are calling the add method. Note that this method will add two numbers and print the output from the AddNumbers Class itself.

addNum.add();

Next, we are calling the addAgain method. Note that this is the second method with an integer data type.

Sum = addNum.addAgain(Number1, Number2);

Program to add two numbers using Bit manipulation

This program uses the Bitwise operators (AND, XOR, and left shift) to add two numbers. Refer to Java Bitwise operators.

Iteration 1:

c = 10 & 50 = 2

a = 10 ^ 50 = 56

b = 2 << 1 = 4

Iteration 2

c = 56 & 4 = 0

a = 56 ^ 4 = 60

b = 0 << 1 = 0

Since b becomes 0, there is no while loop iteration, and the value of a = 60, which is the total.

public class example {
	public static void main(String[] args) {
		int a = 10, b = 50;
		while (b != 0) {
			int c = a & b;
			a = a ^ b;
			b = c << 1;
		}
		System.out.println("Total = " + a);

	}
}

60

Program to add two floating-point numbers

This program allows the user to enter two floating-point numbers and add those two numbers.

import java.util.Scanner;

public class example {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		System.out.print("Enter First Value: ");
		float a = sc.nextFloat();

		System.out.print("Enter Second Value: ");
		float b = sc.nextFloat();

		float Sum = a + b;
		System.out.println("Total = " + Sum);
	}
}

Enter First Value: 22.5
Enter Second Value: 33.3
Total = 55.8

Reusable Program to add two numbers

In this program, we define a function that accepts two numbers and returns the sum of two integers. Next, we declare an array, and our task is to find each row total. Here, the Java array contains four rows and two columns.

public class example {
	public static int sumofTwo(int a, int b) {
		return a + b;
	}

	public static void main(String[] args) {
		int[][] numbers = { { 10, 20 }, { 100, 70 }, { 200, 400 }, { 500, 1000 } };
		for (int[] num : numbers) {
			int x = num[0];
			int y = num[1];
			int sum = sumofTwo(x, y);
			System.out.printf("The sum of %d and %d = %d\n", x, y, sum);
		}
	}
}

The sum of 10 and 20 = 30
The sum of 100 and 70 = 170
The sum of 200 and 400 = 600
The sum of 500 and 1000 = 1500

Also visit

• Java Program to add Two Complex Numbers
• Java Program to Find Cube of a Number