F# Nested if Statement it is always legal in F# programming to nest if/then or if/then/else statements, which means you can use one if or else if statement inside another if or else if statement(s).
Syntax of F# Nested if Statement
if expr then
expr
if expr then
expr
else
expr
else
expr
Example
let a : int32 = 100
let b : int32 = 200
(* check the boolean condition using if statement *)
if (a = 100) then
(* if condition is true then check the following *)
if (b = 200) then
printfn "Value of a is 100 and b is 200\n"
printfn "Exact value of a is: %d" a
printfn "Exact value of b is: %d" b
When you compile and execute the program, it yields the following output −
Value of a is 100 and b is 200 Exact value of a is: 100 Exact value of b is: 200
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