golang to int

Golang is a very popular programming language. Its simplicity, efficiency, rapid development and easy maintenance have made more and more programmers start to learn and use the Golang programming language. During the development process of Golang, it is often necessary to convert strings into integers. So how to implement the process of converting strings into integers in Golang? Next, this article will introduce in detail the string to integer conversion method in Golang.

1. Use the strconv.ParseInt function

In Golang, use the strconv.ParseInt function to convert a string into an integer. This function has three parameters, namely string, base, and number of digits. The base and number of digits parameters are optional. If not specified, they default to 10 and 0.

The sample code is as follows:

package main

import (
    "fmt"
    "strconv"
)

func main() {
    str := "123"
    i, err := strconv.ParseInt(str, 10, 64)
    if err == nil {
        fmt.Printf("%T, %v
", i, i)
    } else {
        fmt.Println(err)
    }
}

In the above sample code, we first use the string "123" to demonstrate how to convert the string to an integer. Next, we call the strconv.ParseInt function, passing the string, base, and number of digits as arguments. Since we are converting the string to an integer of type int64, we specify the number of bits as 64 in the third parameter. Finally, we check for errors and print the results.

2. Use the strconv.Atoi function

In Golang, you can also use the strconv.Atoi function to convert a string to an integer. This function has only one parameter, the string to be converted, and the return value is an integer and an error type. If the conversion is successful, the converted integer is returned, otherwise the error type is returned.

The sample code is as follows:

package main

import (
    "fmt"
    "strconv"
)

func main() {
    str := "123"
    i, err := strconv.Atoi(str)
    if err == nil {
        fmt.Printf("%T, %v
", i, i)
    } else {
        fmt.Println(err)
    }
}

In the above sample code, we also use the string "123" to demonstrate how to convert a string into an integer. The difference is that we use the strconv.Atoi function to convert the string to an integer. If the conversion is successful, the integer is printed, otherwise an error message is printed.

Summary

This article introduces how to convert a string into an integer in Golang, mainly using the two functions strconv.ParseInt and strconv.Atoi, both of which are practical tools provided by Golang. When using these functions, we need to pay attention to the base and number of digits to avoid errors during the conversion process. At the same time, I also hope that this article can help programmers who are learning Golang to better apply Golang to realize their own business needs.

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