How to convert string to integer using strconv.ParseInt function in golang

How to use the strconv.ParseInt function in golang to convert a string into an integer, specific code examples are required

In golang, the strconv package provides a series of characters Functions for converting strings to other types. Among them, the strconv.ParseInt function is used to convert strings to integer types.

It is very simple to use the ParseInt function of the strconv package. The following uses specific code examples to illustrate how to use this function to convert strings to integers.

First, we need to introduce two libraries, strconv and fmt, to implement string conversion and print output.

import ( "fmt" "strconv" )

Then, we define a string variable and assign it to the string that requires integer conversion.

input := "12345"

Next, we use the ParseInt function to convert the string to an integer type. This function accepts three parameters: the string to be converted, the converted base type, and the number of digits in the converted integer.

num, err := strconv.ParseInt(input, 10, 64)

Among them, input is the string to be converted, 10 means that the converted base type is decimal, and 64 means that the converted integer is of int64 type. The function returns the converted integer and any possible errors. In this example, we use two return values, one is the converted integer num, and the other is the possible error err.

Finally, we can determine whether the conversion was successful by judging whether the error is empty. If the conversion is successful, we can print out the converted integer; if the conversion fails, we can print out an error message.

if err == nil { fmt.Println("转换成功，整数为：", num) } else { fmt.Println("转换失败，错误信息为：", err) }

The complete code example is as follows:

package main import ( "fmt" "strconv" ) func main() { input := "12345" num, err := strconv.ParseInt(input, 10, 64) if err == nil { fmt.Println("转换成功，整数为：", num) } else { fmt.Println("转换失败，错误信息为：", err) } }

The output result is:

转换成功，整数为： 12345

Through the above code example, we can see that using the strconv.ParseInt function in golang will Converting a string to an integer is very simple. You only need to pass in the string to be converted and the converted base type and integer type, and the function can complete the conversion and return the result.

This kind of string to integer conversion is very common in actual development. It follows golang's principles of simplicity, standardization and efficiency, helping developers process string data more conveniently.

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