A complete collection of go remainder methods

Core answer of the article: There are three remainder methods in Go: remainder operator %, built-in functions math.Mod() and big.Mod(). Remainder operator %: Calculate the remainder of the division of two integers. math.Mod(x, y): Calculate the remainder of the floating point number x divided by y. big.Mod(x, y): Computes the remainder of any-precision rational number x divided by y.

Comprehensive collection of remainder methods in Go

In Go, the remainder operation is used to calculate the remainder of the division of two numbers. This article will introduce various methods for remainder in Go and provide practical examples to deepen understanding.

Remainder operator

The most direct way to find the remainder is to use the remainder operator %. It calculates the remainder of the division of two integers. For example:

fmt.Println(10 % 3) // 输出：1

Built-in functions

Go also provides two built-in functions to calculate the remainder:

• math.Mod(x, y): Calculate the remainder when x is divided by y, where x and y are floating point numbers.
• big.Mod(x, y): Like math.Mod, but for arbitrary-precision rational numbers.

Example

Let's look at a practical example of calculating the area and perimeter of a rectangle:

package main

import "fmt"

func main() {
    // 矩形长和宽
    length := 10
    width := 5

    // 计算面积
    area := length * width
    fmt.Println("矩形面积：", area)

    // 计算周长
    // 需要使用求余运算符来处理奇数边长
    perimeter := 2 * (length + width)
    fmt.Println("矩形周长：", perimeter)
}

Output:

矩形面积： 50
矩形周长： 30

Negative remainder

It is worth noting that the remainder operator in Go will always produce a non-negative remainder. For negative divisors, the remainder will be the difference between the absolute values ​​of the operand and the divisor.

fmt.Println(-10 % 3) // 输出：2

Summary

This article introduced various methods for calculating remainders in Go, including remainder operators, built-in functions, and practical examples. Understanding these techniques is crucial to writing efficient and reliable Go programs when you need to deal with remainder calculations.

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