In-depth understanding of the strconv.FormatInt function in the Go language documentation to convert integers to strings

There is a very commonly used function FormatInt in the strconv package of Go language. This function is used to convert integers to strings. Through this function, we can convert an integer type data into string type data. This article will delve into the implementation and usage of the strconv.FormatInt function in the Go language documentation.

FormatInt Function syntax

FormatInt The function has 3 parameters, which are:

func FormatInt(i int64, base int) string

Among them, i represents the integer that needs to be converted, base represents the base number of the source number, and the final return is the string form of i.

FormatInt Implementation and usage of the function

Below we will explain in detail the implementation and usage of the FormatInt function in the form of code examples:

package main

import (
    "fmt"
    "strconv"
)

func main() {
    // 十进制整数转字符串
    i := int64(12345)
    str := strconv.FormatInt(i, 10)
    fmt.Printf("The integer %v after conversion is %v (type: %T)
", i, str, str)

    // 二进制整数转字符串 
    i2 := int64(12345)
    str2 := strconv.FormatInt(i2, 2)
    fmt.Printf("The integer %v after conversion is %v (type: %T)
", i2, str2, str2)
}

Code output result:

The integer 12345 after conversion is 12345 (type: string)
The integer 12345 after conversion is 11000000111001 (type: string)

It can be seen from the above code that integers in different bases can be converted to strings by setting the base parameter. For example, in the first conversion, we convert a decimal integer (i=12345) to a string type and print its result to the console. In the second conversion, we convert the same integer (i2=12345) into a binary string, again printing the result to the console.

It is worth noting that the use of the FormatInt function is not limited to decimal and binary conversion, but can also be used for octal or hexadecimal conversion. You only need to change base Just set the corresponding base number for the parameter.

Summary

This article introduces in detail the implementation and usage of the strconv.FormatInt function in the Go language document. The FormatInt function is one of the commonly used string conversion functions in the Go language, which can convert integer type data into string type data. For an in-depth understanding of Go language string operations and their source code, this article hopes to help readers better master Go language-related knowledge.

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