F# - Comparison Operators


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The following table shows all the comparison operators supported by F# language. These binary comparison operators are available for integral and floating-point types. These operators return values of type bool.

Assume variable A holds 10 and variable B holds 20, then −

Operator Description Example
= Checks if the values of two operands are equal or not, if yes then condition becomes true. (A == B) is not true.
<> Checks if the values of two operands are equal or not, if values are not equal then condition becomes true. (A <> B) is true.
> Checks if the value of left operand is greater than the value of right operand, if yes then condition becomes true. (A > B) is not true.
< Checks if the value of left operand is less than the value of right operand, if yes then condition becomes true. (A < B) is true.
>= Checks if the value of left operand is greater than or equal to the value of right operand, if yes then condition becomes true. (A >= B) is not true.
<= Checks if the value of left operand is less than or equal to the value of right operand, if yes then condition becomes true. (A <= B) is true.

Example

let mutable a : int32 = 21
let mutable b : int32 = 10

if (a = b) then
   printfn "Line 1 - a is equal to b"
else
   printfn "Line 1 - a is not equal to b"

if (a < b) then
   printfn "Line 2 - a is less than b"
else
   printfn "Line 2 - a is not less than b"

if (a > b) then
   printfn "Line 3 - a is greater than b"
else
   printfn "Line 3 - a is not greater than b"

(* Lets change value of a and b *)
a <- 5
b <- 20

if (a <= b) then
   printfn "Line 4 - a is either less than or equal to b"
else
   printfn "Line4 - a is a is greater than b"

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

Line 1 - a is not equal to b
Line 2 - a is not less than b
Line 3 - a is greater than b
Line 4 - a is either less than or equal to b
fsharp_operators.htm
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