flex - AS3 adding 1 (+1) not working on string cast to Number? -

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just learning as3 flex. trying this:

var somenumber:string = "10150125903517628"; //this actual number noticed issue  var result:string = string(number(somenumber) + 1);

i've tried different ways of putting expression , no matter seem result equal 10150125903517628 rather 10150125903517629

anyone have ideas??! thanks!

all numbers in javascript/actionscript double-precision ieee-754 floats. these use 64-bit binary number represent decimal, , have precision of 16 or 17 decimal digits.

you've run against limit of format 17-digit number. internal binary representation of 10150125903517628 no different of 10150125903517629 why you're not seeing difference when add 1.

if, however, add 2 (should?) see result 10150125903517630 because that's enough of "step" internal binary representation change.


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