Converting hexadecimal to float in JavaScript

Question

I would like to convert a number in base 10 with fraction to a number in base 16.

var myno = 28.5;

var convno = myno.toString(16);
alert(convno);
         


        

Answer 1

I combined Mark's and Kent's answers to make an overloaded parseFloat function that takes an argument for the radix (much simpler and more versatile):

function parseFloat(string, radix)
{
    // Split the string at the decimal point
    string = string.split(/\./);
    
    // If there is nothing before the decimal point, make it 0
    if (string[0] == '') {
        string[0] = "0";
    }
    
    // If there was a decimal point & something after it
    if (string.length > 1 && string[1] != '') {
        var fractionLength = string[1].length;
        string[1] = parseInt(string[1], radix);
        string[1] *= Math.pow(radix, -fractionLength);
        return parseInt(string[0], radix) + string[1];
    }
    
    // If there wasn't a decimal point or there was but nothing was after it
    return parseInt(string[0], radix);
}