📅 最后修改于: 2020-11-22 17:49:41 🧑 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。
在批处理脚本中，可以使用以下类型的运算符。
批处理脚本语言支持普通算术运算运算符，就像任何语言一样。以下是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 | 2 − 1 will give 1 |
| * | Multiplication of both operands | 2 * 2 will give 4 |
| / | Division of the numerator by the denominator | 3 / 2 will give 1.5 |
| % | Modulus operator and remainder of after an integer/float division | 3 % 2 will give 1 |
关系运算符允许对象的比较。以下是可用的关系运算符。
| Operator | Description | Example |
|---|---|---|
| EQU | Tests the equality between two objects | 2 EQU 2 will give true |
| NEQ | Tests the difference between two objects | 3 NEQ 2 will give true |
| LSS | Checks to see if the left object is less than the right operand | 2 LSS 3 will give true |
| LEQ | Checks to see if the left object is less than or equal to the right operand | 2 LEQ 3 will give true |
| GTR | Checks to see if the left object is greater than the right operand | 3 GTR 2 will give true |
| GEQ | Checks to see if the left object is greater than or equal to the right operand | 3 GEQ 2 will give true |
逻辑运算符用于评估布尔表达式。以下是可用的逻辑运算符。
批处理语言配备了完整的布尔逻辑运算符，例如AND，OR，XOR，但仅适用于二进制数。 TRUE或FALSE都没有任何值。可用于条件的唯一逻辑运算符是NOT运算符。
| Operator | Description |
|---|---|
| AND | This is the logical “and” operator |
| OR | This is the logical “or” operator |
| NOT | This is the logical “not” operator |
批处理脚本语言还提供赋值运算符。以下是可用的赋值运算符。
| Operator | Description | Example |
|---|---|---|
| += | This adds right operand to the left operand and assigns the result to left operand |
Set /A a = 5 a += 3 Output will be 8 |
| -= | This subtracts the right operand from the left operand and assigns the result to the left operand |
Set /A a = 5 a -= 3 Output will be 2 |
| *= | This multiplies the right operand with the left operand and assigns the result to the left operand |
Set /A a = 5 a *= 3 Output will be 15 |
| /= | This divides the left operand with the right operand and assigns the result to the left operand |
Set /A a = 6 a/ = 3 Output will be 2 |
| %= | This takes modulus using two operands and assigns the result to the left operand |
Set /A a = 5 a% = 3 Output will be 2 |
批处理脚本中也可以使用按位运算符。以下是可用的运算符。
| Operator | Description |
|---|---|
| & | This is the bitwise “and” operator |
| | | This is the bitwise “or” operator |
| ^ | This is the bitwise “xor” or Exclusive or 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 |