How to convert character to integer in Golang

In the Go language, converting characters to integers is a very common requirement. Especially when processing strings, the numbers in the string need to be converted into integers for calculation. So, how to convert characters to integer in Golang?

We know that characters are stored in the form of ASCII codes in computers. In Golang, the method of converting characters into integers is also based on ASCII code. Specifically, we can use the function strconv.Atoi(string) in the Golang standard library to convert characters to integers.

So, how to use the strconv.Atoi(string) function? Let’s take a look at it below.

package main

import (
    "fmt"
    "strconv"
)

func main() {
    char := '1'
    // 方式一：将字符转换为字符串后，再将字符串转换为整型。
    intValue, err := strconv.Atoi(string(char))
    if err != nil {
        fmt.Println("转换失败！")
    } else {
        fmt.Println("转换成功！整数值为：", intValue)
    }

    // 方式二：使用int32类型来进行转换
    intValue2 := int32(char - '0')
    fmt.Println("整数值为：", intValue2)
}

In the above example, we defined a character char, the ASCII code value of this character is 49, which is the ASCII code value of character 1. We need to convert it to an integer for calculation. For convenience, we demonstrate two different ways to convert characters to integers.

• The first way: Convert characters to strings, and then use the strconv.Atoi(string) function to convert. If the conversion is successful, the converted integer and nil are returned. If the conversion fails, 0 and an error message indicating that the conversion failed are returned.
• Second way: Use int32 type to convert characters. Because the character type is int32, we can get the integer value represented by the character by subtracting the ASCII code value of character 0.

Both of the above two methods can realize the function of character conversion to integer type. Depending on the actual situation, we can choose any one to use.

To summarize, Golang provides a very simple method to convert characters to integers, that is, the strconv.Atoi(string) function is subtracted from the int32 type. In actual development, we can choose the most suitable method for character conversion according to different business needs.

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