Go语言学习笔记-基本程序结构-运算符

算术运算符

 + - * / % ++ --

不支持前置++ 和前置--

比较运算符

==  !=  >  <  >=  <=

用==比较数组

1. 相同维数且含有相同个数元素的数组才可以比较
2. 每个元素都相等的才相等

数组是引用类型
长度不同的数组比较时会出现编译错误a == b (mismatched types [5]int and [6]int)

逻辑运算符

&&  ||  !

位运算符

&  |  ^  <<  >> 

按位置零运算符&^

1 &^0 -- 1
1 &^1 -- 0
0 &^1 -- 0
0 &^0 -- 0

右边是1则置零，结果总是0；右边是0，原来左边是什么还是什么

package operator_test
import "testing"

const (
        Readable = 1 << iota
        Writable
        Executable

)

func TestCompareArrays(t *testing.T) {
        a := [...]int{1,2,3,4,5}
        //b := [...]int{1,2,3,4,5,6}
        c := [...]int{1,2,3,5,5}
        d := [...]int{1,2,3,4,5}

        //t.Log(a == b)
        t.Log(a == c)
        t.Log(a == d)
}

func TestBitClear(t *testing.T) {
        a := 7//0111
        a = a &^Executable
        a = a &^Readable
        t.Log(a & Readable == Readable,a & Writable == Writable, a & Executable == Executable)
}