How to use the operator of Erlang
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Comparison operator of Erlang
OpDescription== equals / = not equal to = greater than =: = exact equal to = / = the difference between precise non-equal and exact equal:
If you want to compare two numbers, if there are different types between them, such as float and int, the = = operation will first convert the two numbers to the same type. For example:
1 > 1. 0.
True
2 > 1. 0.
False
Therefore, it is generally recommended that accuracy equals to comparison
Compare the size level of the operator:
Number
< atom < reference < fun < port < pid < tuple < list < bit string 3>1 > a.
False
OpDescriptionArgument type+
Number-
Number+
Number-
Number*
Number/ floating point division, the result is floating point numberbnot unary not operator integerdiv integer division, the result is integer integerrem to Yushu integerbandand operation integerboror operation integerbxorxor XOR operation integerbsl left shift operation integerbsr right shift operation integer
Logical operator
OpDescriptionnot unary logic notand logic andor logic orxor logic xor atom true and false represent the "true" and "false" of logic
In addition, the logical operators include an orelse and an andalso
The original or and and did not have a "short circuit" operation, while orelse and andalso had a short circuit operation.
Examples of short circuit operation
Express1 and Express2
Express1 andalso Express2
If Express1 is false, and will continue to judge Express2 and then determine it as a whole, while andalso "short circuit" operation will directly determine that the whole expression is false. In terms of efficiency, andalso will be higher.
The copy code is as follows:
Op Description
= = equal to
/ = not equal to
=
< 小于等于 < 小于 >= greater than or equal to
> greater than
=: = exactly equal to
= / = accurate is not equal to
Examples
The copy code is as follows:
> 1. 0. 0.
True
> 1. 1. 0. 0.
False
> 1 > a.
False
Note: the general language is less than or equal to "
