Parsing Numeric Values from Prompt Boxes in JavaScript
When working with numeric values in HTML and JavaScript, it's often necessary to obtain user input. However, prompting for input returns string values by default. To perform mathematical calculations, we need to convert these strings to numeric types.
Using parseInt() and parseFloat()
JavaScript provides two functions, parseInt() and parseFloat(), to convert strings to integers or floats, respectively.
Syntax:
Parameters:
Example:
Consider the following code:
<code class="javascript">var x = prompt("Enter a Value", "0"); var y = prompt("Enter a Value", "0"); // Convert the strings to integers var num1 = parseInt(x); var num2 = parseInt(y); // Perform calculations var sum = num1 + num2;</code>
After this conversion, you can perform any arithmetic operations on num1 and num2 as they are now numeric values.
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