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优质
小牛编辑
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2023-12-01
下表显示了F＃语言中运算符和其他表达式关键字的优先顺序，从最低优先级到最高优先级。
| 操作者 | 关联性 |
|---|---|
| as | Right |
| when | Right |
| | (pipe) | Left |
| ; | Right |
| let | Non associative |
| function, fun, match, try | Non associative |
| if | Non associative |
| → | Right |
| := | Right |
| , | Non associative |
| or, || | Left |
| &, && | Left |
| op，=，| op，＆op | Left |
| &&&，|||，^^^，~~~，<<>> | Left |
| ^ op | Right |
| :: | Right |
| :?>, :? | Non associative |
| - op, +op, (binary) | Left |
| * op，/ op，％op | Left |
| ** op | Right |
| f x (function application) | Left |
| | (pattern match) | Right |
| prefix operators (+op, -op, %, %%, &, &&, !op, ~op) | Left |
| . | Left |
| f(x) | Left |
| f<types> | Left |
例子 (Example)
let a : int32 = 20
let b : int32 = 10
let c : int32 = 15
let d : int32 = 5
let mutable e : int32 = 0
e <- (a + b) * c/d // ( 30 * 15 )/5
printfn "Value of (a + b) * c/d is : %d" e
e <- ((a + b) * c)/d // (30 * 15 )/5
printfn "Value of ((a + b) * c)/d is : %d" e
e <- (a + b) * (c/d) // (30) * (15/5)
printfn "Value of (a + b) * (c/d) is : %d" e
e <- a + (b * c)/d // 20 + (150/5)
printfn "Value of a + (b * c)/d is : %d" e
编译并执行程序时，它会产生以下输出 -
Value of (a + b) * c/d is : 90
Value of ((a + b) * c)/d is : 90
Value of (a + b) * (c/d) is : 90
Value of a + (b * c)/d is : 50