javascript - Converting a Decimal to a Fraction -

i'm working on "toy problem" supposed write javascript function converts decimal fraction , returns string. example: fractionconverter(2.75) should return "11/4".

here code:

function fractionconverter (number) {   if (number > 0) {     var isnegative = false;   } else if (number < 0) {     var isnegative = true;   }    number = math.abs(number);    if (number % 1 === 0) {     var finalfrac = number + "/1";   } else {     (var = 2; < 10000000000; i++) {       if ((i * number) % 1 === 0) {         var finalfrac = (i * number) + "/" + i;       }       if (finalfrac) { break; }     }   }    var getfrac = function(numstring, bool) {     if (!bool) {       return numstring;     } else {        return "-" + numstring;     }   }    return getfrac(finalfrac, isnegative); } 

sorry formatting. anyway, i'm getting weird spec failure. function returns correct values following numbers: 0.5, 3, 2.5, 2.75, -1.75 , .88. reason, however, failing on 0.253213. returning 1266065/5000000 instead of 253213/1000000. not sure why.

thanks

javascript doesn't deal floating point numbers accurately.

i tried typing node:

0.253213 * 1000000 

and got this:

253213.00000000003 

here different approach testing multiplier

var bignumber = math.pow(10,8);  var isdivisible = (math.round(i * number * bignumber)/bignumber % 1) == 0; 

this of way.

this work way might expect to, if wanted 0.333333333 treated 1/3.

one issue highest integer can have javascript between 10^15 , 10^16.

if ((number * bignumber) > 2^53) not work.