Java Program to Add Two Numbers

Given two integers num1 and num2, the task is to find the sum of the given two numbers in Java.

Example of Addition of Two Numbers

Input: A = 5, B = 6
Output: sum = 11

Input: A = 4, B = 11 
Output: sum = 15  

Program to Add Two Numbers in Java

Below is the implementation of adding two Numbers are mentioned below:

Java

// Java Program to implement
// Direct Addition to Add two Numbers
import java.io.*;

// Driver Class
class GFG {
    public static int sum(int num1, int num2)
    {
        return num1+num2;
    }

      // main function
    public static void main(String[] args)
    {
        GFG ob = new GFG();
        int res = ob.sum(28, 49);
        System.out.println(res);
    }
}

Output

77

Using Bit Manipulation for Addition of Two Numbers in Java

Bitwise Operators are the operators that can directly operate on the bit values.

Below is the implementation of the above method:

Java

// Java Program to implement
// Bit Manipulation to Find
// the Sum of two Numbers
import java.io.*;

// Driver Class
class GFG {
      // function to find sum
    public static int sum(int num1, int num2)
    {
        if (num2 == 0) return num1;
        return sum(num1 ^ num2, (num1 & num2) << 1);
    }

      // main function
    public static void main(String[] args)
    {
        GFG ob = new GFG();
        int res = ob.sum(28, 49);
        System.out.println(res);
    }
}

Output

77

Sum of Three Numbers in Java

Sum of Three Numbers in itself is like Adding Two Numbers Two Times.

Example:

Java

// Java Program to Sum of Three Numbers
import java.io.*;

class GFG {
    public static void main (String[] args) {
          // Three Integers
        int a=1,b=2,c=3;

          // Method 1:

          // Adding sum of a+b and then
          // sum of a+b with c
          int k=a+b;
          int result=k+c;

          // Printing to Sum
          System.out.println("Method 1: Sum a+b+c = "+result);

          // Method 2:

          // Printing the Sum of Three
          // Variables(Numbers)
          System.out.println("Method 2: Sum a+b+c = "+(a+b+c));
    }
}

Output

Method 1: Sum a+b+c = 6
Method 2: Sum a+b+c = 6

Sum of N Numbers in Java

Sum of N Numbers in Java can be done using the Steps mentioned below:

• Take input of N Numbers
• Use Loop to Add the N Numbers in Java(Iterate and Sum simultaneously)
• Print the Sum calculated.

Below is the implementation of the above method:

Java

// Java Program to Add N Numbers
import java.io.*;
import java.util.*;

// Driver Class
class GFG {
    // main function
    public static void main(String[] args)
    {

        // N is the number if elements
        int N;

        // Initialising the Scanner Class
        Scanner sc = new Scanner(System.in);

          System.out.println("Enter the Number of elements:"

        // Taking the input of N
        N = sc.nextInt();
        int sum = 0;

        // Taking N inputs and find the sum
        for (int i = 0; i < N; i++) {
            int a = sc.nextInt();

            sum += a;
        }

        // Printing the sum of N numbers
        System.out.println("Sum of Input Numbers : " + sum);
    }
}

Output:

Enter the Number of elements: 4
10
20
30
40
Sum of Input Numbers : 100

Miscellanous of Addition of Two Numbers in Java

These are the two Methods for Adding Two Numbers which are bit complex to implement as compared to the methods mentioned above.

1. Sum of Two Numbers Using Command Line Arguments in Java

Java

// Java Program to find
// Sum of Two Numbers Using
// Command Line
import java.io.*;

// Driver Class
class GFG {
      // main function
    public static void main (String[] args) {

          // Command Line Input
          // Stored in Variables
          int a= Integer.parseInt(args[0]);
        int b= Integer.parseInt(args[1]);

          // Printing Sum of variables
        System.out.println("Sum:"+(a+b));
    }
}

Output

2. Program to Add Two BigIntegers in Java

BigIntegers are the numbers that exceed the limit of Integers So we created another class called BigInteger.

Below is the implementation of the Addition of Two BigIntegers:

Java

// Java program to demonstrate
// add() method of BigInteger
import java.math.BigInteger;

// Driver Class
public class GFG {
      // main function
    public static void main(String[] args)
    {
        // BigInteger object to store result
        BigInteger sum;

        // For user input
        // Use Scanner or BufferedReader

        // Two objects of String created
        // Holds the values to calculate the sum
        String input1 = "9482423949832423492342323546";
        String input2 = "6484464684864864864864876543";

        // Convert the string input to BigInteger
        BigInteger a = new BigInteger(input1);
        BigInteger b = new BigInteger(input2);

        // Using add() method
        sum = a.add(b);

        // Display the result in BigInteger
        System.out.println("Sum of Two BigIntegers: "
                           + sum);
    }
}

Output

Sum of Two BigIntegers: 15966888634697288357207200089