How to find remainder in golang

In computer programming, finding the remainder is a common operation. In Golang, there are many methods to find the remainder. This article will introduce these methods, their differences and application scenarios.

1. Use the modulo operator (%)

In Golang, you can use the modulo operator (%) to find the remainder of two numbers. For example:

a := 7
b := 3
c := a % b // c 的值为 1

In this example, we calculated the remainder of 7 divided by 3 and the result is 1. Note that if the dividend is negative, the result is still positive. For example:

a := -7
b := 3
c := a % b // c 的值为 -1

It should be noted that when calculating the remainder of a floating point number through the modulo operator, a compilation error will occur. For example:

a := 5.2
b := 2.5
c := a % b // 编译错误

Therefore, the following method should be used when calculating the remainder of a floating point number.

2. Use the functions in the math package

Golang’s math package provides some functions related to remainders, which can handle floating point numbers. These functions include:

1. math.Mod(x, y): Returns the remainder of x divided by y, with the result having the same sign as x.

x := 5.2
y := 2.5
z := math.Mod(x, y) // z 的值为 0.2

It should be noted that if y is zero, a runtime error will result.

2. math.Remainder(x, y): Returns the remainder of x divided by y. The result has the same sign as x.

x := -7.3
y := 3.1
z := math.Remainder(x, y) // z 的值为 -1.1

It should be noted that if y is zero, a runtime error will result.

3. Methods of using Golang structure

You can define methods in the Golang structure to calculate the remainder. This method can encapsulate the calculation process in a structure, making the code more standardized and easier to maintain. The following is an example of using a structure:

type Calculator struct {}

func (c Calculator) Mod(a, b int) int {
    return a % b
}

func main() {
    calc := Calculator{}
    a := 7
    b := 3
    c := calc.Mod(a, b) // c 的值为 1
}

In this example, we define a Calculator structure and define a Mod method in it. This method accepts two integers as parameters and returns their remainder. In the main function, we instantiate a Calculator object and call the Mod method to calculate the remainder.

Summary

This article introduces several methods of finding remainders in Golang, including using the modulo operator, functions in the math package, and using structures. In actual programming, we can choose the most suitable method according to the specific situation. If you need to calculate the remainder of an integer, you can use the modulo operator; if you need to calculate the remainder of a floating point number, you can use the function in the math package; if there are multiple places in the project where you need to calculate the remainder, you can encapsulate it through a structure method this process.

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