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 OverflowparseInt() 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.
JavaScript will "convert" numeric string to integer, if you perform calculations on it (as JS is weakly typed). But you can convert it yourself using parseInt or parseFloat.
Just remember to put radix in parseInt!
In case of integer inputs:
var x = parseInt(prompt("Enter a Value", "0"), 10);
var y = parseInt(prompt("Enter a Value", "0"), 10);
In case of float:
var x = parseFloat(prompt("Enter a Value", "0"));
var y = parseFloat(prompt("Enter a Value", "0"));
how do I get the value (numeric) of the prompt box??
parseInt() not working with prompt()
Could we use +prompt() instead of parseInt() ?
Why not use parseInt with the prompt?
Videos
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
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!