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常用运算符与运算符优先级
2022-07-05 19:36:00 【叼个小孩尝尝鲜】
一、常用运算符
1、算数运算符
2、关系运算符
3、逻辑运算符
4、赋值运算符
5、条件运算符(唯一一个三元运算符)
二、算数运算符
基本的算数运算符
/ * % + -
三、关系运算符
测试两个值之间的关系,返回为true或false
<
<=
=
==
!=
===
!==
四、逻辑运算符
-&&(逻辑与):只有在操作数和第二个操作数都是ture时,其余为false
-!!(逻辑或):只有在第一个操作数和第二个操作数都是false,结果false,其余为true
-!(逻辑非):求反
五、赋值运算符
=、+=、-=、*=、/=、%=
六、条件运算符
三元运算符:–?--:–
第一个操作数为布尔值,为ture,计算第二个操作数,并返回计算结果,否则,计算第三个操作数,并返回计算结果
七、运算符优先级
运算符 | 操作 |
---|---|
! | 逻辑非 |
* 、/、 % | 乘、除、取余 |
<、<=、>、>= | 小于、小于等于、大于、大于等于 |
==、!= | 判断等于、判断不等于 |
===、!= | 判断恒等于、判断恒不等于 |
&& | 逻辑与 |
ll | 逻辑或 |
?: | 条件运算符 |
=、+=、-=、*=、/=、%=等 | 赋值运算符 |
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