How Do You Add a Double Data Type?


Larry Thompson

Adding a double data type in programming is a common task that often comes up when working with numerical values. In this tutorial, we will explore how to add a double data type using HTML and JavaScript.

What is a Double Data Type?

A double data type is a floating-point numeric data type that can store decimal numbers with a larger range and higher precision compared to other numeric data types like integers or floats. It is often used when precise calculations or decimal values are required.

Adding a Double Data Type

To add two double values together, you can use the addition operator (+) in JavaScript. Here’s an example:

      var num1 = 3.14;
      var num2 = 1.5;
      var sum = num1 + num2;
      document.write("The sum of " + num1 + " and " + num2 + " is " + sum);

In the above code snippet, we declare two variables num1 and num2, assigned with the values 3.14 and 1.5 respectively. We then create another variable called sum which stores the sum of these two variables using the addition operator (+).

To display the result, we use the document.write() method to output the text “The sum of [num1] and [num2] is [sum]” where [num1], [num2], and [sum] are replaced with their respective values.

Example Output:

The sum of 3.5 is 4.64

It’s important to note that the result of adding two double values will also be a double value.


In this tutorial, we learned how to add two double values using HTML and JavaScript. We explored the syntax for addition, as well as an example that demonstrated the concept in action.

The ability to work with double data types is valuable when dealing with calculations involving decimal numbers. By understanding how to add double values, you can perform more precise calculations in your code.

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