Golang division retains decimals

In Golang, division operations need to pay attention to how decimals are retained. By default, golang will automatically round decimals, and the result will be infinitely close instead of equal to the expected result. In some scenarios that require precise calculations, such as financial systems, precision after the decimal point needs to be ensured, so it is necessary to retain decimals.

Golang provides several methods to implement decimal retention operations. In this article, we will explore these methods and their pros and cons.

Method 1: Use the Printf function of the fmt package

The fmt package is a formatted output method provided in Golang. The Printf function can use a format string to define the format of the output, including retaining the number of decimal places. Here is an example:

package main

import (

"fmt"

)

func main() {

a := 3
b := 2
c := float64(a) / float64(b)

fmt.Printf("%.2f", c)

}

This code will output the value of c, retaining two decimal places. This is a quick and easy method, but it does not save the result into a variable.

Method 2: Use the ParseFloat function of the strconv package

The strconv package is a string processing package provided in Golang. The ParseFloat function can convert a string to a floating point number and specify the number of decimal points. Here is an example:

package main

import (

"fmt"
"strconv"

)

func main() {

a := 3
b := 2
c := float64(a) / float64(b)

f, _ := strconv.ParseFloat(fmt.Sprintf("%.2f", c), 64)

fmt.Println(f)

}

In this code, we use the fmt.Sprintf function to format the value of c into a string with two decimal places, and then use the strconv.ParseFloat function to convert to a floating point number. This method saves the result to a variable, but requires an extra processing step to format the floating point number.

Method 3: Use the Round function of the math package

The Round function is the rounding function provided in Golang, which can round floating-point numbers to the specified number of decimal places. Here is an example:

package main

import (

"fmt"
"math"

)

func main() {

a := 3
b := 2
c := float64(a) / float64(b)

f := math.Round(c*100) / 100

fmt.Println(f)

}

In this code, we use the math.Round function to round the value of c to two decimal places, and then divide it by 100 to get the final result. This method saves the result to a variable and requires no additional formatting.

Summary

The above are three ways to retain decimals in Golang. They each have their own advantages and disadvantages, and they need to be selected according to actual needs when using them. In scenarios involving financial calculations that require precision, it is recommended to use Method 2 and Method 3 to ensure the accuracy of the results.

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