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
It is done as an initial step in the parsing after whitespace is removed. If no signs are found, the algorithm moves to the following step; otherwise, it removes the sign and runs the number-parsing on the rest of the string. If parseInt encounters a character in the input string that is not a valid numeral in the specified radix, it ignores it and all succeeding characters and returns the integer value parsed up to that point.
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W3Schools
w3schools.com › jsref › jsref_parseint.asp
JavaScript parseInt() Method
If the value begins with "0x", JavaScript assumes radix 16. If the first character cannot be converted, NaN is returned. Leading and trailing spaces are ignored. Only the first integer found is returned. Older browsers will return 8 for parseInt("010"). Older versions of ECMAScript used octal (radix 8) for values beginning with "0".
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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 26, 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);: ...