Java program to addition of two numbers | 5 different Methods

Java program to addition of two numbers

In this tutorial, we will discuss the  Java program to addition of two numbers 

In this post we are going to learn how to find sum of two numbers through different 5 ways

Method 1

Program 1: Sum of two numbers -standard method

public class AddTwoNumber{
public static void main(String args[]){
int num1=10,num2=15,sum;//Declare variables num1,num2,sum;
sum=num1+num2;  //find sum of two numbers
System.out.println("Sum of two numbers: "+sum);
//display the sum of the numbers
}
}

When the above code is executed it produces the following output

Sum of two numbers: 25

In this program

1. Integer variable num1,num2 are declared and initialized
2. the num1 and num 2 both are added together  and the value is added to the sum
3. Then, the program is displayed the output  of sum (Sum of two integers) using System.out.println()
   

Method 2

Program 2: Sum of two numbers (entered by user).

import java.util.Scanner;
public class AddTwoNumbers1{
public static void main(String args[]){
int num1,num2,sum;

Scanner scan=new Scanner(System.in);
//create a scanner instance for receives input
// from the user - input from keyboard
System.out.print("Enter Two numbers for addition: ");
num1=scan.nextInt();
num2=scan.nextInt();
//reads the numbers from the user
//input from keyword

sum=num1+num2;  //find sum of two numbers
System.out.println("Sum of two numbers: "+sum);
//display the sum of the numbers

}
}

When the above code is executed, it produces the following output

Enter two numbers for addition: 345
570
Sum of two numbers: 915

Approach

1. Declare variables num1,num2,sum
2. The program requires input from the user
3. Then the user enters the input value for num1, num2(variables)
4. The program will read the input using Scanner class and stores in the variables num1 and num2 respectively
5. the num1 and num 2 both are added together  and the value is added to the sum
6. Then, the program displays the value of the sum using System.out.print() function

 

Method 3

Sum of two numbers – User defined method

import java.util.Scanner;
public class AddTwoNumbers2{
public static void main(String args[]){

Scanner scan=new Scanner(System.in);
//create a scanner instance for receives input
// from the user - input from keyboard
System.out.print("Enter Two numbers for addition: ");
int num1=scan.nextInt();
int num2=scan.nextInt();
//reads the numbers from the user
//input from keyword


System.out.println("Sum of two numbers: "+addition(num1,num2));
//display the sum of the numbers
}

static int addition(int x, int y){ //Define a user defined method
return x+y;


}
}

When the above code is executed, it produces the following output

Enter two numbers for addition: 125
250
Sum of two numbers: 375

Approach

1. Declare variables num1, num2, sum
2. The program requires input from the user
3. Then the user enters the input value for num1, num2
4. The program will read the input using Scanner class and store in the variables num1 and num2 respectively
5. Define the method (addition ()) for find sum
6. Call the method to produced output
7. Then, the program Displays the value of sum using System.out.println() function

 

Method 4

Sum of two numbers- User recursion

import java.util.Scanner;
class SumOfNum{
public static void main(String args[]){
    int sum;  //variable declaration
    Scanner scan=new Scanner(System.in);
//create a scanner object for input

System.out.print("Enter the value for num1: ");
int num1=scan.nextInt();
System.out.print("Enter the value for num2: ");
int num2=scan.nextInt();

     sum=add(num1,num2);
   System.out.print("Sum of two numbers are:"+sum);
} 
static int add(int x, int y)
{
    if(y==0)
        return x;
    else
        return(1+add(x,y-1));
}
}

When the above code is executed it produces the following output

Enter the value for num1: 26
Enter the value for num2: 54
Sum of two numbers are: 80

Approach

1. Declare variables num1,num2,sum
2. The program requires input from the user
3. Then the user enters the input value for num1, num2
4. The program will read the input using Scanner class and store in the variables num1 and num2 respectively
5. Define the method (addition()) for find sum recursively
6. Call the method to produced output
7. Then, the program Displays the value of sum using System.out.printf() function

Method 5

Sum of two numbers – without Arithmetic operator

import java.util.Scanner;
class AddNumWithOutPlus{
public static void main(String args[]){
    Scanner scan=new Scanner(System.in); //create a scanner object for input
System.out.print("Enter the first number: ");
int num1=scan.nextInt();//get input from the user for num1
System.out.print("Enter the second number: ");
int num2=scan.nextInt();//get input from the user for num2

while(num2 != 0){
int num3=(num1 & num2);
num1=num1^num2;
num2=num3<<1;
}
System.out.print("Sum of two numbers is: "+num1);
}
}

When the above code is executed it produces the following output

Enter the first number: 123
Enter the second number: 234
Sum of two numbers is: 357

 

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