parseInt() or parseFloat() are functions in JavaScript which can help you convert the values into integers or floats respectively.

Syntax:

 parseInt(string, radix);
 parseFloat(string); 
  • string: the string expression to be parsed as a number.
  • radix: (optional, but highly encouraged) the base of the numeral system to be used - a number between 2 and 36.

Example:

 var x = prompt("Enter a Value", "0");
 var y = prompt("Enter a Value", "0");
 var num1 = parseInt(x);
 var num2 = parseInt(y);

After this you can perform which ever calculations you want on them.

Answer from Anurag-Sharma on Stack Overflow
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MDN Web Docs
developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › parseInt
parseInt() - JavaScript | MDN
If it's unprovided, or if the value becomes 0, NaN or Infinity (undefined is coerced to NaN), JavaScript assumes the following: If the input string, with leading whitespace and possible +/- signs removed, begins with 0x or 0X (a zero, followed by lowercase or uppercase X), radix is assumed to be 16 and the rest of the string is parsed as a hexadecimal number. If the input string begins with any other value, the radix is 10 (decimal). Note: Other prefixes like 0b, which are valid in number literals, are treated as normal digits by parseInt().
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W3Schools
w3schools.com › jsref › jsref_parseint.asp
JavaScript parseInt() Method
The parseInt method parses a value as a string and returns the first integer. A radix parameter specifies the number system to use: 2 = binary, 8 = octal, 10 = decimal, 16 = hexadecimal. If radix is omitted, JavaScript assumes radix 10.
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Codecademy
codecademy.com › forum_questions › 5575df34937676a0b50000e8
Does prompt always come back as a string that you have to convert? | Codecademy
We can make a loose comparison: ... and all are valid. Taking the number check approach, we can use parseInt() to parse out a number, is one exists....
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Webdevelopersnotes
webdevelopersnotes.com › the-javascript-prompt-getting-user-input
The JavaScript prompt – Getting user input
The parseInt() converts a string to an integer value while parseFloat() parses the string converting it to a floating point number. Note: An integer is a whole number without any fractional part while floating-point numbers have a decimal part.
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YouTube
youtube.com › watch
Prompt() & parseInt()|Javascript - YouTube
#javascript #cobol #sqlPrompt() & parseInt() in Javascript.Input value and convert into integer data type.Learn python, Java, COBOL, C++, Oracle,SQL,PL/SQL,H...
Published   January 13, 2022
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Reddit
reddit.com › r/learnjavascript › how do i get the value (numeric) of the prompt box??
r/learnjavascript on Reddit: how do I get the value (numeric) of the prompt box??
July 27, 2024 -

Hello everyone.

I am currently doing a project on the Odin Project and I need to get the value (numeric) of the prompt box which pop-ups with a button click.

I searched a bit how to this online and I think that I can use the value property for getting the value and I also found out that the return value of the prompt is always string and I need to use parseInt property for converting string to number.

So, I came up with the code below, but I didn't get the prompt box after I click the button

=>

const
 btn = document.querySelector("button");

    btn.addEventListener("click", () 
=>
 {

        
const
 input = parseInt.prompt("Enter the number of squares of the new grid").value;

      
    })

and then I tried this and this time I get the prompt box

=>

const
 btn = document.querySelector("button");

    btn.addEventListener("click", () 
=>
 {

        
const
 input = prompt("Enter the number of squares of the new grid");

        
const
 newinput = parseInt.input.value;

    })

but I am not really sure whether I really get the value ( I mean store it in the variable).

Can you give me feedback about this?

I need this prompt value as I will use it change the div numbers in the page based on the entered number.

I am providing my codepen: https://codepen.io/albert9191/pen/vYqVLvJ

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Rouvelle
rouvelle.com › javaScript_strings_to_numbers.htm
JavaScript: Prompts and turning Strings in Numbers using parseInt() and parseFloat()
Getting values into the program using prompt(). Turning strings into numbers using parseInt() and parseFloat().
Find elsewhere
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Iidproductions
iidproductions.com › JStutorials › Basics › parseInt.asp
Iidproductions
HTML Tutorials · CSS Tutorials · Dreamweaver Tutorials · Hyperlinks Image Rollovers Web Photo Albums Status Bar Message Behavior Popup Messages Behavior (Alert Boxes) Open New Window Behavior Show-Hide Layers Behavior · Flash Tutorials · Frame Labels gotoAndPlay() Creating Buttons Interactive ...
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IncludeHelp
includehelp.com › code-snippets › input-value-from-the-user-using-prompt.aspx
JavaScript | Input value from the user using prompt
<!DOCTYPE html> <HTML> <HEAD> <SCRIPT> var msg = prompt("Enter an integer value:"); var num = parseInt(msg) document.write(msg); </SCRIPT> </HEAD> <BODY> </BODY> </HTML> Output · To input numbers i.e., integer values in JavaScript using the text boxes, you need to parse the input value because the text box returns the string.
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Guamcc
ifs.guamcc.edu › adminftp › academics › computer › ycflores › CS211 › JS_Prompts.pdf pdf
JavaScript Prompts
JavaScript Prompts · prompt( ) method · The prompt() method displays a dialog box that prompts the visitor for · input. • Return value from the prompt is always a STRING. • If the value entered is a number, the number needs to be converted. • If the user clicks “cancel”, null (nothing) ...
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Sololearn
sololearn.com › en › Discuss › 2952070 › javascript-user-input-solved
JavaScript User Input [SOLVED] | Sololearn: Learn to code for FREE!
You must cast the value to a number type and you can either use: Number(prompt()) or parseInt(prompt()). Strings see '+' as concatenating operator. And the string with just numeric values are implicitly converted to numbers and the operation ...
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GeeksforGeeks
geeksforgeeks.org › javascript › javascript-program-to-print-an-integer-entered-by-user
JavaScript Program to Print an Integer Entered by user - GeeksforGeeks
February 22, 2024 - One of the simplest ways to get user input and display output in a web browser is by using the prompt() function to capture input and the alert() function to display the output. HTML · <!DOCTYPE html> <html> <body> <script> let userInteger ...
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MDN Web Docs
developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › Number › parseInt
Number.parseInt() - JavaScript | MDN
function roughScale(x, base) { const parsed = Number.parseInt(x, base); if (Number.isNaN(parsed)) { return 0; } return parsed * 100; } console.log(roughScale(" 0xF", 16)); // Expected output: 1500 console.log(roughScale("321", 2)); // Expected output: 0 ... The value to parse, coerced to a string.
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SheCodes
shecodes.io › athena › 60744-what-is-parseint-in-javascript
[JavaScript] - What is parseInt() in JavaScript? - SheCodes | SheCodes
Learn about the parseInt() function in JavaScript and how it converts a string argument to an integer of a specified radix.
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Reddit
reddit.com › r/learnjavascript › prompt function in js ? (eloquent javascript book)
r/learnjavascript on Reddit: prompt function in JS ? (Eloquent JavaScript book)
May 14, 2021 -

Hi there,

I started to teach my self JS via the book " Eloquent JavaScript"

I encounter the use of prompt function in the book, which I understand is suppose to take an input from the user (similar to 'scanf' in C (?))

I'm using Visual Studio Code. When I try to run this code:

let theNumber = Number(prompt("Pick a number"));
if (!Number.isNaN(theNumber)) {
console.log("Your number is the square root of " +
theNumber * theNumber);
}

I'm getting an error message: "ReferenceError: prompt is not defined"

How can I use to "prompt" function in JS ?

Thanks for helping!

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Brainly
brainly.in › computer science › secondary school
var a=parseInt(prompt(“Enter the amount”)); II. document.write(b); III. b=a*2; Choose the correct sequence - Brainly.in
February 27, 2024 - To print double the amount entered by the user, let’s analyze the given JavaScript statements: var a=parseInt(prompt("Enter the amount"));: This line prompts the user to enter an amount and stores it in the variable a. document.write(b);: ...