学习Go-第三天-基础语法（整型：int、int8、int16、

Go：int、int8、int16、int32、int64
PHP：int

php声明一个整型：

$a = 123;        //  $变量 = 值 分号

Go声明一个整型：

var a  int               //  var 变量名 变量类型（不需要分号）

Go批量声明一个整型：

var (
    a int
    b int8
    c int16
)

Go简短的写法:

a := 100
a,b,c := 100,200,300    //多个同时赋值

int、int8、int16、int32、int64的区别：

package main

import (
    "fmt"
    "unsafe"
)

func main() {
    var a int
    a = 100
    fmt.Print(a)

    var b int = 200
    fmt.Println(b)

    c := 300
    fmt.Println(c)

    d,f,g := 100,200,300
    fmt.Println(d,f,g)

    var i1 int = 1
    var i2 int8 = 2
    var i3 int16 = 3
    var i4 int32 = 4
    var i5 int64 = 5
    fmt.Println(i1)
    fmt.Println(i2)
    fmt.Println(i3)
    fmt.Println(i4)
    fmt.Println(i5)
    fmt.Println(unsafe.Sizeof(i1))
    fmt.Println(unsafe.Sizeof(i2))
    fmt.Println(unsafe.Sizeof(i3))
    fmt.Println(unsafe.Sizeof(i4))
    fmt.Println(unsafe.Sizeof(i5))
}

图截不全，下面是打印的数据，上面是源码

1588044514(1).jpg

unsafe.Sizeof官方解释：Sizeof takes an expression x of any type and returns the size in bytes of a hypothetical variable v as if v was declared via var v = x. The size does not include any memory possibly referenced by x. For instance, if x is a slice, Sizeof returns the size of the slice descriptor, not the size of the memory referenced by the slice. 意思就是占的大小，你会发现int居然占8字节

小伙伴如果看到错误和见解希望指出，难免有理解错的地方（努力学习Go-ing）.

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