Programming Exercise 4-5

Instructions CheckDigit.cs 1 using Systen; 2 using static System.Console; 3 class CheckDigit Account numbers sometimes contain a check digit that is the result of a mathematical calculation. The inclusion of the digit in an account number helps ascertain whether the number is a valid one. 5 static void Main() 6 // rite your matn here Write an application named CheckDigit that asks a user to enter a four-digit account number and determines whether it is a valid number The number is valid if the fourth digit is the remainder when the number represented by the first three digits of the four-digit number is divided by 7. For example, 7770 is valid, because 0 is the remainder when 777 is divided by 7. If the account number is valid, output The account number is valid. Otherwise output Invalid