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So I am making a script that adds two numbers (decimal numbers) together, which I have encountered a problem.
http://jsfiddle.net/DerekL/esqnC/
I made the script, it turns out pretty good:
0.1 + 0.5 //0.6 0.2 + 0.3 //0.5 But soon I see:
0.1 + 0.2 //0.30000000000000004 0.01 + 0.06 //0.06999999999999999 And it does not look right to me. I know it is a shortcoming of using float point with finite bits, but I can't find a way to fix that.
Math.ceil //No Math.floor //No .slice //No UPDATE
Is it possible to multiply the numbers by 1000 first, then add them then divide it by 1000?
432
Because internally, computers use a format (binary floating-point) that cannot accurately represent a number like 0.1, 0.2 or 0.3 at all.
The toFixed() method converts a number to a string. The toFixed() method rounds the string to a specified number of decimals.
Rounding a decimal number to two decimal places is the same as rounding it to the hundredths place, which is the second place to the right of the decimal point. For example, 2.83620364 can be round to two decimal places as 2.84, and 0.7035 can be round to two decimal places as 0.70.
STEP 1 − Declare a variable named “num” and assign a number to the variable. STEP 2 − Compute num. toFixed(2). The result is formatted with two decimals.
Use toFixed to convert it to a string with some decimal places shaved off, and then convert it back to a number.
+(0.1 + 0.2).toFixed(12) // 0.3 It looks like IE's toFixed has some weird behavior, so if you need to support IE something like this might be better:
Math.round((0.1 + 0.2) * 1e12) / 1e12 If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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