F# - if/then statement

An if/then statement consists of a Boolean expression followed by one or more statements.

Syntax

The if/then construct in F# has the following syntax −

(* simple if *)
if expr then
   expr

Flow diagram

Example

let a : int32 = 10

(* check the boolean condition using if statement *)
if (a < 20) then
   printfn "a is less than 20\n"
   printfn "Value of a is: %d" a

When you compile and execute the program, it yields the following output −

a is less than 20

Value of a is: 10