Validation

Validation

Validation is the process that attempets to prevent nonsensical inputs.

The term "Constraints" are often used to describe limiting factors which be used to validate user inputs.

Try/catch is one example of constraint to limit the input. Other types of validation do not use special functions (blocks of code are designed to do a particular job). Other types of validation do not use special functions (blocks of code are designed to do a particular job).

note

It is important to build in validation rules into a solution as it will check whether the inputs are sensible and prevents inaccurate results, run-time errors or fatal crashes.

When error occur a post action check will direct the user what to do or what mistake that they have made.

public static void Main(){
    try{ //try these lines of code
        Console.WriteLine("...");

    }
    catch(exception e){ //catch any exception
        Console.WriteLine("please enter a number");
    }
}

Range Check: Assess whether data entered is within mium to maximum range

Lenght Check: A lenght check assess how many character hae been entered

Presence Check: This checks to see if data exits. This ensure important inputs are not left blank

Type Check: Assess whether the data entered is in the correct data types

Format Check: checks whether the data entered is in the correct format

Check Digit: This check is used to check if the value is a Digit

Check isChar