JavaScript Program to Add Two Numbers

Introduction

Adding two numbers is one of the fundamental operations in programming, and JavaScript offers several ways to perform this task. Whether you're developing a web application, working on server-side scripting with Node.js, or simply practicing coding skills, understanding how to manipulate numbers is crucial.

In this article, you will learn how to add two numbers in JavaScript through various examples. This will include basic addition operations, adding numbers received from user input, and implementing addition within a function for reusability.

Basic Addition in JavaScript

Performing a Simple Add Operation

1. Assign values to two variables.

2. Use the + operator to add these variables.

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   let num1 = 5;
   let num2 = 10;
   let sum = num1 + num2;
   console.log(sum); // Output: 15
   

   This code initializes two variables num1 and num2 with values 5 and 10, respectively. The + operator is then used to add these values, storing the result in sum. Finally, the result is printed to the console.

Addition Using User Inputs

Add Two Numbers Entered by the User

1. Use prompt() to get input from the user.

2. Convert the input from strings to integers using parseInt().

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   let num1 = parseInt(prompt("Enter the first number: "));
   let num2 = parseInt(prompt("Enter the second number: "));
   let sum = num1 + num2;
   alert("The sum is: " + sum);
   

   This snippet uses the prompt() function to capture user inputs. Since prompt() returns strings, parseInt() is utilized to convert these strings to integers. The numbers are then added, and the result is displayed to the user via alert().

Addition Inside a Function

Create a Function to Add Two Numbers

1. Define a function that takes two parameters.

2. Add the parameters and return the result.

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   function addNumbers(num1, num2) {
       return num1 + num2;
   }
   
   let result = addNumbers(15, 25);
   console.log("Sum obtained from the function: " + result);
   

   Here, addNumbers is a function defined to take two parameters (num1 and num2). Inside the function, these parameters are added using the + operator. The function returns the sum. When called with 15 and 25 as arguments, the function returns 40, which is then printed to the console.

Conclusion

Adding two numbers in JavaScript can be accomplished in a variety of ways, from simple arithmetic operations to handling user inputs and embedding addition logic within reusable functions. By mastering these basic numeric operations, you enhance your ability to handle more complex mathematical tasks in JavaScript applications. Utilize these examples to apply addition operations where necessary in your projects, ensuring that your application can perform essential calculations efficiently.