📅 最后修改于: 2020-11-04 05:49:25 🧑 作者: Mango
运算符是一个符号，告诉编译器执行特定的数学或逻辑操作。
Erlang具有以下类型的运算符-
Erlang语言支持普通的算术运算运算符，就像任何一种语言一样。以下是Erlang中可用的算术运算运算符。
| Operator | Description | Example |
|---|---|---|
| + | Addition of two operands | 1 + 2 will give 3 |
| − | Subtracts second operand from the first | 1 – 2 will give -1 |
| * | Multiplication of both operands | 2 * 2 will give 4 |
| / | Division of numerator by denominator | 2 / 2 will give 1 |
| rem | Remainder of dividing the first number by the second | 3 rem 2 will give 1 |
| div | The div component will perform the division and return the integer component. | 3 div 2 will give 1 |
关系运算符允许比较对象。以下是Erlang中可用的关系运算符。
| Operator | Description | Example |
|---|---|---|
| == | Tests the equality between two objects | 2 = 2 will give true |
| /= | Tests the difference between two objects | 3 /= 2 will give true |
| < | Checks to see if the left object is less than the right operand. | 2 < 3 will give true |
| =< | Checks to see if the left object is less than or equal to the right operand. | 2 =<3 will give true |
| > | Checks to see if the left object is greater than the right operand. | 3 > 2 will give true |
| >= | Checks to see if the left object is greater than or equal to the right operand. | 3 >= 2 will give true |
这些逻辑运算符用于评估布尔表达式。以下是Erlang中可用的逻辑运算符。
| Operator | Description | Example |
|---|---|---|
| or | This is the logical “or” operator | true or true will give true |
| and | This is the logical “and” operator | True and false will give false |
| not | This is the logical “not” operator | not false will give true |
| xor | This is the logical exclusive “xor” operator | True xor false will give true |
Erlang提供了四个按位运算运算符。以下是Erlang中可用的按位运算运算符。
| Sr.No. | Operator & Description |
|---|---|
| 1 |
band This is the bitwise “and” operator |
| 2 |
bor This is the bitwise “or” operator |
| 3 |
bxor This is the bitwise “xor” or Exclusive or operator |
| 4 |
bnot This is the bitwise negation operator |
以下是展示这些运算符的真值表-
| p | q | p & q | p | q | p ^ q |
|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 |
| 0 | 1 | 0 | 1 | 1 |
| 1 | 1 | 1 | 1 | 0 |
| 1 | 0 | 0 | 1 | 1 |
下表显示了运算符优先级的运算符二郎神与他们一起的关联优先级的降序。运算符优先级和关联性用于确定非括号表达式中的评估顺序。
| Operators | Associativity |
|---|---|
| : | |
| # | |
| bnot,not | |
| /,*,div,rem,band,and | Left associative |
| +,-,bor,bxor,or,xor | Left associative |
| ==,/=,=<,<,>=,> |