Introducing the method of converting strings to numbers in Golang

Introduction to the method of converting strings to numbers in Golang, specific code examples are required

In Golang, converting strings to numbers is a common operation, you can Used to process user-entered form data, configuration file reading and other scenarios. This article will introduce several commonly used methods of converting strings to numbers and provide corresponding code examples.

1. Use the Atoi or ParseInt function of the strconv package

The strconv package is a package in Golang for converting between strings and basic types. Among them, the Atoi function is used to convert the string to the int type, and the ParseInt function is used to convert the string to the int64 type of the specified base.

The following is the sample code:

package main

import (
    "fmt"
    "strconv"
)

func main() {
    str := "12345" // 待转换的字符串

    // 使用Atoi函数将字符串转换为int类型
    num, err := strconv.Atoi(str)
    if err != nil {
        fmt.Printf("转换失败：%v
", err)
    } else {
        fmt.Printf("转换结果：%d
", num)
    }

    // 使用ParseInt函数将字符串转换为int64类型
    num64, err := strconv.ParseInt(str, 10, 64)
    if err != nil {
        fmt.Printf("转换失败：%v
", err)
    } else {
        fmt.Printf("转换结果：%d
", num64)
    }
}

In the above example, str is the string to be converted, use the Atoi function to convert it to int type, and use the ParseInt function to convert it to int64 type. If the conversion fails, the appropriate error message will be returned.

2. Use the ParseFloat function of the strconv package

In addition to converting integer values, sometimes you also need to convert strings to floating point numbers. The strconv package also provides the ParseFloat function for converting strings to float64 type.

The following is the sample code:

package main

import (
    "fmt"
    "strconv"
)

func main() {
    str := "3.14" // 待转换的字符串

    // 使用ParseFloat函数将字符串转换为float64类型
    num, err := strconv.ParseFloat(str, 64)
    if err != nil {
        fmt.Printf("转换失败：%v
", err)
    } else {
        fmt.Printf("转换结果：%f
", num)
    }
}

In the above example, str is the string to be converted, use the ParseFloat function to convert it to the float64 type. If the conversion fails, the appropriate error message will be returned.

3. Use the ParseUint function of the strconv package

If you need to convert a string to an unsigned integer (that is, a non-negative number), you can use the ParseUint function of the strconv package.

The following is the sample code:

package main

import (
    "fmt"
    "strconv"
)

func main() {
    str := "4294967295" // 待转换的字符串

    // 使用ParseUint函数将字符串转换为uint64类型
    num, err := strconv.ParseUint(str, 10, 64)
    if err != nil {
        fmt.Printf("转换失败：%v
", err)
    } else {
        fmt.Printf("转换结果：%d
", num)
    }
}

In the above example, str is the string to be converted, use the ParseUint function to convert it to the uint64 type. If the conversion fails, the appropriate error message will be returned.

Summary:

This article introduces several common methods of converting strings to numbers in Golang, and provides corresponding code examples. The specific method to choose can be decided according to the scenario and needs. During use, you need to pay attention to issues such as handling of exceptions and data overflow. Hope this article is helpful to readers.

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