Detailed explanation of data types in Go language

Title: Detailed explanation of data types in Go language

In Go language, data types are a very important concept. Go language provides rich data types, including basic data types, composite data types and custom data types. This article will introduce in detail the commonly used data types in the Go language and give specific code examples.

1. Basic data types

1. Integer type

In Go language, integer data types include int, int8, int16, int32, int64 , uint, uint8, uint16, uint32, uint64, etc. Among them, the size of int depends on the word length of the current platform, while uint represents an unsigned integer type.

Sample code:

package main

import "fmt"

func main() {
    var a int = 10
    var b uint = 20
    fmt.Println(a, b)
}

2. Floating point type

There are two types of floating point data types in Go language: float32 and float64, which represent single Precision floating point and double precision floating point.

Sample code:

package main

import "fmt"

func main() {
    var a float32 = 3.14
    var b float64 = 6.28
    fmt.Println(a, b)
}

3. Character type

The character type in Go language is rune, which represents a Unicode character.

Sample code:

package main

import "fmt"

func main() {
    var ch rune = '中'
    fmt.Println(ch)
}

4. String

The string type in Go language is string, which is expressed by double quotes or backticks.

Sample code:

package main

import "fmt"

func main() {
    var str1 string = "Hello, world!"
    var str2 string = `Go语言`
    fmt.Println(str1, str2)
}

2. Composite data type

1. Array

In Go language, arrays have a fixed length And the element type is the same data type.

Sample code:

package main

import "fmt"

func main() {
    var arr [5]int = [5]int{1, 2, 3, 4, 5}
    fmt.Println(arr)
}

2. Slice

Slice is a dynamic array in the Go language with an unfixed length.

Sample code:

package main

import "fmt"

func main() {
    var slice []int = []int{1, 2, 3, 4, 5}
    fmt.Println(slice)
}

3. Structure

Structure is a custom data type that can contain different types of fields.

Sample code:

package main

import "fmt"

type Person struct {
    Name string
    Age  int
}

func main() {
    var p Person
    p.Name = "Alice"
    p.Age = 25
    fmt.Println(p)
}

4. Mapping

Mapping is an unordered collection of key-value pairs.

Sample code:

package main

import "fmt"

func main() {
    var m map[string]int = map[string]int{
        "a": 1,
        "b": 2,
        "c": 3,
    }
    fmt.Println(m)
}

3. Custom data types

In Go language, you can use the type keyword to define custom data types.

Sample code:

package main

import "fmt"

type MyInt int

func main() {
    var a MyInt = 10
    fmt.Println(a)
}

Summary:

This article introduces the commonly used data types in Go language, including basic data types, composite data types and custom data types, and Corresponding code examples are given. Familiarity with and understanding of various data types is the basis for learning and using Go language. I hope readers can better master the data types in Go language through this article.

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