How to Perform Addition in Java

Are you new to Java and still wondering how to perform addition in Java? Or perhaps you just need a refresher on the topic? Either way, you’ve come to the right place. In this article, we will guide you through the basics of performing addition in Java. We will cover the different types of variables, operators, and syntax used in Java to perform addition. By the end of this article, you will have a solid understanding of how to perform addition in Java.

Table of Contents

Understanding Variables in Java

Before we dive into performing addition in Java, we need to understand the concept of variables. In Java, a variable is a container that stores a value. A variable can have different types, such as integer, double, or string.

To declare a variable in Java, you need to specify its type and give it a name. For example, to declare an integer variable, you can use the following syntax:

int number = 10;

In this example, we declared an integer variable named “number” and assigned it the value of 10.

Adding Two Numbers in Java

Now that we understand the concept of variables, let’s move on to adding two numbers in Java. To add two numbers in Java, we use the addition operator, which is represented by the “+” symbol. Here’s an example:

int num1 = 5;
int num2 = 10;
int sum = num1 + num2;
System.out.println(sum);

In this example, we declared two integer variables “num1” and “num2” with values 5 and 10, respectively. We then declared a third integer variable “sum” and assigned it the value of the sum of num1 and num2. Finally, we printed the value of “sum” using the System.out.println() method.

The output of this program would be:

15

Adding Floating-Point Numbers in Java

What if we want to add two floating-point numbers in Java? In that case, we use the same addition operator as before. Here’s an example:

double num1 = 2.5;
double num2 = 3.5;
double sum = num1 + num2;
System.out.println(sum);

In this example, we declared two double variables “num1” and “num2” with values 2.5 and 3.5, respectively. We then declared a third double variable “sum” and assigned it the value of the sum of num1 and num2. Finally, we printed the value of “sum” using the System.out.println() method.

The output of this program would be:

6.0

Adding Multiple Numbers in Java

What if we want to add more than two numbers in Java? In that case, we can use the same addition operator to add multiple numbers. Here’s an example:

int num1 = 5;
int num2 = 10;
int num3 = 15;
int sum = num1 + num2 + num3;
System.out.println(sum);

In this example, we declared three integer variables “num1”, “num2”, and “num3” with values 5, 10, and 15, respectively. We then declared a fourth integer variable “sum” and assigned it the value of the sum of num1, num2, and num3. Finally, we printed the value of “sum” using the System.out.println() method.

The output of this program would be:

30

Adding User-Inputted Numbers in Java

What if we want to add numbers that are inputted by the user? In that case, we need to use the Scanner class in Java. The Scanner class allows us to read user input from the console. Here’s an example:

import java.util.Scanner;

public class Addition {
   public static void main(String[] args) {
      Scanner input = new Scanner(System.in);
      System.out.println("Enter the first number: ");
      int num1 = input.nextInt();
      System.out.println("Enter the second number: ");
      int num2 = input.nextInt();
      int sum = num1 + num2;
      System.out.println("The sum is: " + sum);
   }
}

In this example, we imported the Scanner class and created a new Scanner object “input”. We then prompted the user to enter two numbers using the System.out.println() method and read the user input using the input.nextInt() method. We then declared a third integer variable “sum” and assigned it the value of the sum of num1 and num2. Finally, we printed the value of “sum” using the System.out.println() method.

Conclusion

In conclusion, performing addition in Java is a fundamental concept that every Java developer should know. In this article, we covered the basics of adding two numbers, adding floating-point numbers, adding multiple numbers, and adding user-inputted numbers in Java. We also discussed the concept of variables and the addition operator. We hope that this article has helped you understand how to perform addition in Java.

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