Some considerations for floating point division in golang

In golang, there are two main data types that can be used to represent floating point numbers, namely float32 and float64. When we need to perform division operations, we will find that division of float types is different from division of integer types. Because floating point numbers have precision issues, you need to pay attention to some details when performing division operations.

First of all, you need to pay attention to the situation of dividing floating point numbers by 0. In golang, for a float type 0 value, whether divided by 0 or divided by 0, you will get infinity (inf) or negative infinity (-inf).

Secondly, you need to pay attention to the accuracy of floating point numbers. Since floating point numbers are stored in binary form, there will be a certain accuracy error when performing operations. For example, if we execute the following code:

a := 0.1
b := 0.2
fmt.Println(a + b)

we will find that the output result is not 0.3, but 0.30000000000000004. This is because 0.1 and 0.2 cannot be represented accurately when stored in binary form, and precision errors will occur during addition operations. In this case, we can use the Decimal type in golang to perform precise floating point operations.

Finally, you need to pay attention to the rounding problem of floating point numbers. When performing division operations, we need to pay attention to retaining the number of digits after the decimal point and performing appropriate rounding. In golang, floating point numbers can be rounded using the Round function in the built-in math library. For example, we can use the following code to round floating point numbers and retain two decimal places:

a := 3.1415926
b := 2.7182818
result := math.Round(a / b * 100) / 100
fmt.Println(result)

The above are some notes on floating point division in golang. When performing floating-point number operations, you need to pay attention to precision issues and rounding issues, and make adjustments according to the actual situation.

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