How to convert string to int type in golang

In the Go language, converting string to int is a common operation. When we need to convert a string to an integer type, we can do it using the functions provided in the strconv package. In this article, we will walk through sample code to detail how to convert a string to an integer type using functions from the strconv package.

1. strconv.Atoi

The Atoi function in the strconv package can convert a string to an int type. The following is a sample code for string conversion using the Atoi function:

package main

import (
    "fmt"
    "strconv"
)

func main() {
    str := "123"
    i, err := strconv.Atoi(str)
    if err != nil {
        fmt.Println("转换失败")
    } else {
        fmt.Println(i)
    }
}

This code first defines a string variable str, and then we call the Atoi function in the strconv package to convert the string to an integer type. If the conversion is successful, the Atoi function will return a value of type int. If the conversion fails, the function returns an error object. In the sample code, we use an if statement to determine whether the conversion is successful, and if it fails, the corresponding error message is output.

2. strconv.ParseInt

The ParseInt function can convert a string to the int64 type. The following is a sample code for string conversion using the ParseInt function:

package main

import (
    "fmt"
    "strconv"
)

func main() {
    str := "123"
    i, err := strconv.ParseInt(str, 10, 64)
    if err != nil {
        fmt.Println("转换失败")
    } else {
        fmt.Println(i)
    }
}

In this code, we use the ParseInt function to convert a string to the int64 type. The function accepts three parameters: the string to be converted, the base to be converted (10 represents decimal), and the expected return type (int64 in the example). If the conversion is successful, the function returns a value of type int64. If the conversion fails, an error object will be returned.

3. Comparison of strconv.Atoi and strconv.ParseInt

We have introduced two methods of converting strings to integer types, then What is the difference between these two methods?

• Return type

The Atoi function converts a string to int type, while the ParseInt function converts a string to int64 type.

• Range Limitation

Since the range of the int type is smaller than the int64 type, when using the Atoi function, you need to pay attention to whether the integer represented by the string exceeds the range of the int type. .

• Error handling

The Atoi function will return an error object when the conversion fails, while the ParseInt function requires us to manually determine whether the conversion is successful.

4. Summary

#In this article, we introduced how to convert a string to an integer type using the functions in the strconv package. Whether you use the Atoi function or the ParseInt function, they have their own characteristics and scope of application. You need to choose the appropriate method according to the specific scenario. During use, we need to pay attention to the representation range and error handling of strings. I hope this article can help you better understand how to convert between string and integer types in Go language.

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