F# program to find Modulus of two numbers using Functions

Program

open System
let modulus a b  = try
                    let mutable c = 0
                    c <- a % b;
                     Console.WriteLine("Modulus of two numbers is:\t{0}" , c); 1
                    with 
                    | :? System.DivideByZeroException as ex -> Console.WriteLine(ex.Message); 0
Console.Write("Enter the first number:\t")
let first = Int32.Parse(Console.ReadLine())
Console.Write("Enter the second number:\t")
let second = Int32.Parse(Console.ReadLine())
// Function modulus is called
let result = modulus first second

Output 1

Enter the first number: 456
Enter the second number:        5
Modulus of two numbers is:      1

Output 2

Enter the first number: 4
Enter the second number:        789
Modulus of two numbers is:      4

Output 3

Enter the first number: 333
Enter the second number:        0
Attempted to divide by zero.