如何避免或解决下限函数和错误表示的整数？

Question

So I am trying to take a number that can be in any positive form and cut it to two decimal places. So for example I have an input of 145.26. However in my code this is being rounded down to 145.19. Here is the code I am using:

        var multiplier = 100;
        var adjustedNum = input * multiplier;
        var truncatedNum = Math[adjustedNum < 0 ? 'ceil' : 'floor'](adjustedNum);
        var fixedResult =  truncatedNum / multiplier;

So basically my 'input' should become 145200. However it is actually becoming 145199.9999995 or something to that effect. This is causing the Math.floor method to round it down. Is there any way to workaround or avoid this?

Answer 1

Multiply the number by an additional factor of 10 to round it. Then divide it by 10 to apply the floor or ceil .

var multiplier = 100;
var adjustedNum = Math.round(input * multiplier * 10);
var truncatedNum = Math[adjustedNum < 0 ? 'ceil' : 'floor'](adjustedNum/10);
var fixedResult =  truncatedNum / multiplier;