What is the usage of golang atoi

The strconv package in the Go language provides conversion functions between strings and basic types, including atoi (converting strings to integers). Let's take a look at the usage of golang atoi.

What is atoi?

atoi (ASCII to Integer) is a C Standard library function used to convert ASCII strings to integers. It is very commonly used in C language and has become a standard. In Go language, we can also use this function.

Using atoi in Go

Using atoi in Go language is very simple. We just need to import the strconv package and then use the strconv.Atoi() function to convert the string to an integer. Here is the sample code:

import (
    "fmt"
    "strconv"
)

func main() {
    str := "123"
    num, err := strconv.Atoi(str)
    if err == nil {
        fmt.Println(num)
    }
}

In the above example, str is a string that contains the number to be converted to an integer. strconv.Atoi()The function converts str to an integer and stores the result in the num variable. We also use the err variable to check if the conversion was successful. If the conversion is successful, the integer is printed to the console.

If the input string cannot be converted to an integer, the strconv.Atoi() function will return an error object of type strconv.NumError. We can use the following code to check and print this error:

import (
    "fmt"
    "strconv"
)

func main() {
    str := "abc"
    num, err := strconv.Atoi(str)
    if err != nil {
        fmt.Println(err)
    } else {
        fmt.Println(num)
    }
}

In the above example, str contains a non-numeric character, which will cause the conversion to fail. Therefore, the strconv.Atoi() function will return an error object, which we print to the console.

Summary

In Go language, we can use the Atoi() function in the strconv package to convert a string into an integer. If the input string can be converted to an integer, the function returns the integer value and returns a nil error. If the input string cannot be converted to an integer, the function returns an error object. The Atoi() function is a very useful tool if you need to convert between strings and integers in Go code.

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