PHP round（$ num，2）和javascript toFixed（2）没有为此值53.955提供正确的输出

Question

I have one php function and having

phpans = round(53.955,2)

and javascript function

var num  = 53.955;
var jsans = num.toFixed(2);
console.log(jsans);

both jsans and phpans is giving different $phpans = 53.96 ans jsans = 53.95 . I can not understand why this is happening .. Thanks is Advance

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Answer 1

Because computers can't represent floating numbers properly. It's probably 53.95400000000009 or something like that. The way to deal with this is multiply by 100, round, then divide by 100 so the computer is only dealing with whole numbers.

var start = 53.955,
        res1,
        res2;
    
    res1 = start.toFixed(2);
    res2 = (start * 100).toFixed(0) / 100;
    console.log(res1, res2);

//Outputs
"53.95"
53.96

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