Learn the strconv.Atoi function in the Go language documentation to convert strings to integers

Learn the strconv.Atoi function in the Go language document to convert strings to integers

Go language is a powerful and flexible programming language, and its standard library The strconv package provides string conversion functions. In this post, we will learn how to convert string to integer using strconv.Atoi function.

First, we need to understand the purpose and declaration of the strconv.Atoi function. The description of the function in the document is as follows:

func Atoi(s string) (int, error)

The s in the function signature represents the string to be converted. This function parses a string into an integer and returns the converted integer value and an error. If the conversion is successful, an integer value and nil will be returned; if the conversion fails, 0 and an appropriate error will be returned.

Next, let’s learn how to use the strconv.Atoi function through some code examples.

package main

import (
    "fmt"
    "strconv"
)

func main() {
    // 示例一：转换成功
    s1 := "123"
    i1, err1 := strconv.Atoi(s1)
    if err1 == nil {
        fmt.Printf("转换成功：字符串 "%s" 转换为整数 %d
", s1, i1)
    } else {
        fmt.Printf("转换失败：%s
", err1.Error())
    }

    // 示例二：转换失败
    s2 := "abc"
    i2, err2 := strconv.Atoi(s2)
    if err2 == nil {
        fmt.Printf("转换成功：字符串 "%s" 转换为整数 %d
", s2, i2)
    } else {
        fmt.Printf("转换失败：%s
", err2.Error())
    }
}

In the above code, we first imported the fmt and strconv packages. Then, we defined two strings s1 and s2 as "123" and "abc" respectively. Next, we use the strconv.Atoi function to convert the strings s1 and s2 into integers.

In Example 1, since the string "123" can be converted to an integer, the conversion is successful and the converted integer value and nil are returned. We determine whether the conversion is successful by judging whether err1 is nil. If err1 is nil, it means the conversion is successful, and we print out the conversion result through the fmt.Printf function.

In example 2, because the string "abc" cannot be converted to an integer, the conversion fails and returns 0 and a corresponding error. We determine whether the conversion is successful by judging whether err2 is nil. Since err2 is not nil, it means that the conversion failed. We print out the error message of the conversion failure through the fmt.Printf function.

Through the above example, we learned how to use the strconv.Atoi function in the Go language documentation to convert a string into an integer. By using this function, we can easily convert string type data to integer type, which provides convenience for us to handle string conversion needs in actual development.

The above is the detailed content of Learn the strconv.Atoi function in the Go language documentation to convert strings to integers. For more information, please follow other related articles on the PHP Chinese website!