A complete guide to converting Golang characters to integers-Golang-php.cn

In the Go language, methods for converting characters to integers include: using the strconv.Atoi function to convert strings to integers. Use the strconv.ParseInt function to convert a string to an integer in the specified base. Represents a single Unicode character using a Unicode literal and converts it to an integer.

A complete guide to converting Golang characters to integers

Complete guide to converting Go language characters to integers

In the Go language, the character type (rune) can represent Unicode characters , while integer types (int,int8, etc.) represent numeric values. Therefore, in some cases, characters need to be converted to integers.

String to integer

Atoi

##strconv.AtoiThe function converts a string to an integer.

import ( "fmt" "strconv" ) func main() { str := "1234" n, err := strconv.Atoi(str) if err != nil { fmt.Println(err) } else { fmt.Println("Int:", n) } }

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Output:

Int: 1234

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ParseInt

strconv.ParseIntFunction converts a string to an integer in the specified base.

n, err := strconv.ParseInt(str, 10, 64) // 10 为十进制基数，64 为位数

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Convert a single character to an integer

Use Unicode literal value

Unicode literal value can represent a single Unicode character.

r := '1' n := int(r - '0')

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Practical Case

When processing user input or parsing other data, it is common to need to convert characters into integers. For example:

Read integers from the command line

fmt.Println("请输入一个整数:") var n int fmt.Scan(&n) // 从 stdin 读入并解析为整数

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Process JSON data

type Data struct { Age int `json:"age"` } json.Unmarshal(data, &d) // JSON 数据反序列化为结构体

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Parse file path

path := "path/to/file.txt" size := path[len(path)-5:] // 获取文件大小部分 n, err := strconv.Atoi(size)

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