How to implement division and rounding in Golang

Practical method of division and rounding in Golang

In programming languages, division operation is one of the very common operations. However, in some cases we may want to get the result of integer division instead of the default floating point division result. In Golang, there are several ways to achieve this. This article will introduce some practical methods of division and rounding in Golang and provide specific code examples.

Method 1: Use type conversion

A simple method is to use type conversion to convert the floating point result into an integer. This can be achieved using the built-in int() function. Here is a sample code:

package main

import "fmt"

func main() {
    var dividend, divisor float64 = 10, 3
    result := int(dividend / divisor)
    fmt.Println(result) // 输出：3
}

In this example, we use two floating point numbers dividend and divisor. By converting the division result to an integer, we get the desired integer result.

Method 2: Use the remainder operator

Another method is to use the remainder operator% to calculate the integer part of the quotient. Here is a sample code:

package main

import "fmt"

func main() {
    var dividend, divisor int = 10, 3
    result := dividend / divisor + dividend % divisor
    fmt.Println(result) // 输出：3
}

In this example, we use two integers dividend and divisor. By calculating the integer part of the quotient and adding the remainder, we obtain the desired integer result.

Method 3: Use the function in the math package

Another method is to use the function in the math package to implement division and rounding. Here is a sample code:

package main

import (
    "fmt"
    "math"
)

func main() {
    var dividend, divisor float64 = 10, 3
    result := math.Trunc(dividend / divisor)
    fmt.Println(result) // 输出：3
}

In this example, we use two floating point numbers dividend and divisor. By using the Trunc function from the math package, we get the desired integer result.

Summary

This article introduces three methods to implement division and rounding in Golang: using type conversion, using the remainder operation and using functions in the math package. Depending on your specific needs, you can choose a suitable method to achieve the desired integer result. Whether it is a simple type conversion or a more complex mathematical operation, you can choose the most suitable method according to the actual situation.

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