qWrite a C$++$code: credit card number follow certain patterns. a credit card number musthave between $13$ and $16$digits$.$ it must start with $4$ for visa cards, $5$ for master cards, $37$ for american express cards, $6$ for discover cards. in $1954,$hans luhn of IBM proposed an algorithm for validating credit card numbers. the algorithm is useful to determine if a card number is entered correctly or if a credit cards is scanned correctly by a scanner. almost all credit card numbers are generated following this validity check, commonly known as the luhn check or the mod $10$ check, which can be described as f $($for illustration consider the card number $4388576018402626)$: $1.$double every second digit from right to left. if doubling of a digit results in a twodigit number, add up the two digits to get a singledigit number. $2*2=4,2*2=4,4*2=8,1*2=2,6*2=12(1+2=3),5*2=10(1+0=1),8*2=16(1+6=7),4*2=82.$now add all singledigit number from step $1.4+4+8+2+3+1+7+8=373.$add all digits in the odd places from right to left in the card number$6+6+0+8+0+7+8+3=384.$sum the results from step $2$ and $3.37+38=755.$ if the result from step $4$ is divisible by $10,$the card nuber is valid; otherwise it is invalid. for example, the number $4388576018402626$ is invalid but $4388576018410707$or $4147200059780942$ is valid.write a program that prompts the user to enter a credit card number as a long integer. display whether the number is valid or invalid. the code requirements are: $1$: your code will create a class called MyClass $2$: there are two ways to define functions$/$methods that belong to a class: inside class definitions or outside class definitions. you will use the second for this programming exercise. this means that you will declare all the methods$/$functions inside the class. but the definitions for each will be done outside of the class. $3$: my class must contain the following methods$/$functions: long MyClass::getSize$($long d$)$ and long MyClass:getPrefix$($long number, int k$),$ and bool MyClass::prefixMatched $($long number, int d$),$ and int MyClass::getDigit$($int number$),$ and int MyClass::sumOfDoubleEvenPlace$($long number$),$ and int MyClass::sumOffOddPlace$($long number$),$ and bool MyClass::isValid$($long number$)4$: now for the main$()$ function: int main$()\{$MyClass myObj; $//$create an object of my class cout$<$ number$//$ now call the fist member function isValid$($number$)-$above $//$process the outcome of above$\}$ document every block of the program.