F#中if/elif/else语句

语法

在F＃编程语言中if / then / elif / else语句的语法是 

if expr then
   expr
elif expr then
   expr
elif expr then
   expr
...
else
   expr

实例

let a : int32 = 100

(* check the boolean condition using if statement *)

if (a = 10) then
   printfn "Value of a is 10\n"
elif (a = 20) then
   printfn " Value of a is 20\n"
elif (a = 30) then
   printfn " Value of a is 30\n"
else
   printfn " None of the values are matching\n"
   printfn "Value of a is: %d" a

当编译和执行程序时，它会产生以下输出 

None of the values are matching

Value of a is: 100