Is there a standard type in Go that can do 'exact division'?

Is there a standard type in Go that can do "exact division"? This is a common question, let’s answer it. In Go, there is no standard type that can perform "exact division" because the integer types in Go are fixed-precision and cannot represent infinite-precision decimals. However, Go provides a solution by using floating point types for division operations. Floating-point number types in Go include float32 and float64, which can represent a larger range of numbers, but due to the characteristics of floating-point numbers, there may be a loss of precision. Therefore, if exact division is required, it is recommended to use a large number library (such as the math/big package) to handle it. This ensures accurate results when performing division operations.

Question content

I want to do some "exact division" in go. Are there standard types?

For example, I want to store the values ​​"1/3" and "2/3" and be able to add them.

I can define my own type like this:

type mytype struct {
    numerator   int
    denominator int
}

And define the following functions:

func (a MyType) Plus(b MyType) MyType {
    d := a.Denominator * b.Denominator
    n := (a.Numerator * b.Denominator) + (b.Numerator * a.Denominator)

    return MyType{Numerator: n, Denominator: d}
}

But there may be a more elegant way to do this, or a "standard type" that already does this.

Solution

I don’t know big.Rat. That's all I need! thank you for your help

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