运算符是告诉编译器执行特定的数学或逻辑的操作的符号。Go的内置符号包括
- 算术运算符
- 关系操作符
- 逻辑运算符
- 位运算符
- 赋值操作符
以逻辑运算符为例，如下表
| 运算类型 | Go Operator | ||
|---|---|---|---|
| AND | && | ||
| OR | |||
| NOT |
以位运算符为例，如下表
| 运算类型 | Go Operator | Sample |
|---|---|---|
| AND | & | p & q |
| OR | | | p | q |
| XOR | p ^ q | |
| NOT | ~ | ~p |
| Left shift | << | p << 1 |
| Right shift | >> | p >> 2 |
赋值操作符 = += -= *= /= %= <<= >>= ^= |=
其他操作符
| Go Operator | Note |
|---|---|
| & | return the address of a variable |
| * | pointer to a variable |
运算符的优先级 operator precedence 优先级决定表达式的分组，影响表达式的求解。从高到底的顺序如下表
| Category | Operator | Associativity | ||
|---|---|---|---|---|
| Postfix | () [] -> . ++ - - | Left to right | ||
| Unary | + - ! ~ ++ - - (type)* & sizeof | Right to left | ||
| Multiplicative | * / % | Left to right | ||
| Additive | + - | Left to right | ||
| Shift | << >> | Left to right | ||
| Relational | < <= > >= | Left to right | ||
| Equality | == != | Left to right | ||
| Bitwise AND | & | Left to right | ||
| Bitwise XOR | Left to right | |||
| Bitwise OR | | | Left to right | ||
| Logical AND | && | Left to right | ||
| Logical OR | Left to right | |||
| Assignment | = += -= *= /= %=>>= <<= &= ^= | = | Right to left | |
| Comma | , | Left to right |
