5.1 * 100 != 510 🤯 , Why you have to be careful with Doubles and Floats !

This content originally appeared on DEV Community and was authored by Shrihari Mohan

Internally Integers and Floats are stored differently.
This is how integers are stored depending upon the machine the number of bits will be different. ( Normally it will be 32 or 64 bit)

By default most of the modern languages save a float/double
as double precision( 64 Bit) But for this blog I will show you a 32 bit model! For the same value 20 but 20.0 will be saved in the IEEE754 Double Precision Format.

Below is the image showing single precision format

But why ?

This is because we can save integers easily in the binary form but not floats. Floats are special numbers and always require special care when dealing them especially if you're using them for calculations. This talks about Floats and Binary

5.1

We can see there are some errors during the conversion of this float to binary. This is why we get this title.

In our company we deal with a lot of transactions and taxes! Hence we always take care of floating points. Recently we found this exact bug where we missed to deal with floats, it cost us with wrong calculations. But we knew what was wrong immediately. Peace 🕊

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This content originally appeared on DEV Community and was authored by Shrihari Mohan

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