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Is JavaScript's Math broken?
when i subtract 6.4-1.6 i am getting the answer as 4.800000000000001 in JS, but i need as 4.8 without using toFixed(), toPrecision() and Math.round(). any idea???
Thanks,
crystal
212
Use the toFixed() method to format a number to 2 decimal places, e.g. num. toFixed(2) . The toFixed method takes a parameter, representing how many digits should appear after the decimal and returns the result.
JavaScript Number toFixed() The toFixed() method converts a number to a string. The toFixed() method rounds the string to a specified number of decimals.
The subtraction operator ( - ) subtracts the two operands, producing their difference.
Convert to integers before doing the subtraction to avoid problems with floating point arithmetic:
(6.4 * 10 - 1.6 * 10) / 10
See What Every Programmer Should Know About Floating-Point Arithmetic
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This is a well-known limitation of IEEE 754 floating point numbers. See How to deal with floating point number precision in JavaScript? for solutions.
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