Erlang的运算符(比较运算符,数值运算符,移位运算符,逻辑运算符)
如果要比较两个数，如果两个数之间是不同的类型，比如float和int那么，==操作会首先把两个数字转换成相同的相同类型
Erlang的比较运算符
opDescription==等于/=不等于==大于等于>大于=:=精确的等于=/=精确的不等于等于和精确等于的区别：
如果要比较两个数，如果两个数之间是不同的类型，比如float和int那么，==操作会首先把两个数字转换成相同的相同类型。举例：
1> 1==1.0.
true
2> 1=:=1.0.
false
所以一般推荐用精确等于去比较
比较运算符的大小级别：
number
3> 1 > a.
false
opDescriptionArgument type+
number-
number+
number-
number*
number/浮点数除法，结果是浮点数numberbnot一元not运算符integerdiv整数除法，结果是整数integerrem求玉树integerbandand运算integerboror运算integerbxorxor异或运算integerbsl左移位操作integerbsr右移位操作integer
逻辑运算符
opDescriptionnot一元逻辑notand逻辑andor逻辑orxor逻辑xor原子true 和false表示逻辑的”真”和”假”
此外，逻辑运算符还包括一个orelse 和andalso
原始的or和and是不带”短路运算”操作的，而orelse和andalso是带短路运算操作的。
短路运算举例
Express1 and Express2
Express1 andalso Express2
如果Express1 为假，and会继续判断Express2，然后整体判定为假，而andalso”短路”操作，直接判定整个表达式为假，从效率上来说，andalso会高一些
复制代码 代码如下:
op Description
== 等于
/= 不等于
=>= 大于等于
> 大于
=:= 精确的等于
=/= 精确的不等于
Examples
复制代码 代码如下:
> 1==1.0.
true
> 1=:=1.0.
false
> 1 > a.
false
注: 一般语言的 小于等于 是"
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