using System;
namespace CreditCards
{
/// <summary>
/// Summary description for CreditCardValidator.
/// </summary>
public class CreditCardValidator
{
public CreditCardValidator()
{
//
// TODO: Add constructor logic here
//
}
public bool ValidateCC(string creditNo)
{
int indicator = 1; //-- will be indicator for every other number
int firstNumToAdd = 0; //-- will be used to store sum of first set of numbers
int secondNumToAdd = 0; //-- will be used to store second set of numbers
string num1; //-- will be used if every other number added is greater than 10, store the left-most integer here
string num2; //-- will be used if ever yother number added is greater than 10, store the right-most integer here
//-- Convert our creditNo string to a char array
char[] ccArr = creditNo.ToCharArray();
for (int i=ccArr.Length-1;i>=0;i--)
{
char ccNoAdd = ccArr[i];
int ccAdd = Int32.Parse(ccNoAdd.ToString());
if (indicator == 1)
{
//-- If we are on the odd number of numbers, add that number to our total
firstNumToAdd += ccAdd;
//-- set our indicator to 0 so that our code will know to skip to the next piece
indicator = 0;
}
else
{
//-- if the current integer doubled is greater than 10
//-- split the sum in to two integers and add them together
//-- we then add it to our total here
if ((ccAdd + ccAdd) >= 10)
{
int temporary = (ccAdd + ccAdd);
num1 = temporary.ToString().Substring(0,1);
num2 = temporary.ToString().Substring(1,1);
secondNumToAdd += (Convert.ToInt32(num1) + Convert.ToInt32(num2));
}
else
{
//-- otherwise, just add them together and add them to our total
secondNumToAdd += ccAdd + ccAdd;
}
//-- set our indicator to 1 so for the next integer we will perform a different set of code
indicator = 1;
}
}
//-- If the sum of our 2 numbers is divisible by 10, then the card is valid. Otherwise, it is not
bool isValid = false;
if ((firstNumToAdd + secondNumToAdd) % 10 == 0)
{
isValid = true;
}
else
{
isValid = false;
}
return isValid;
}
/// <summary>
/// Get and check to make sure that the chosen credit card type matches the
/// card number
/// </summary>
/// <param name="CCNum">string</param>
/// <returns>bool</returns>
public bool RetrieveCCType(string CCNum, int intChosenType)
{
// return value
bool bResult = false;
if (Convert.ToInt32(CCNum.Substring(0,2)) >= 51 && Convert.ToInt32(CCNum.Substring(0,2)) <= 55)
{
// Check to see that the type of card that the user selected
// matches the
if(intChosenType == 3)
{
bResult = true;
}
else
{
bResult = false;
}
}
else if (Convert.ToString(CCNum.Substring(0,1)) == "4")
{
// Visa
if(intChosenType == 4)
{
bResult = true;
}
else
{
bResult = false;
}
}
else if (Convert.ToString(CCNum.Substring(0,2)) == "34" || Convert.ToString(CCNum.Substring(0,2)) == "37")
{
// american express
// check to see that the card matches the type they chose
if(intChosenType == 1)
{
bResult = true;
}
else
{
bResult = false;
}
}
else if(Convert.ToString(CCNum.Substring(0,4)) == "6011")
{
// Discover card
if(intChosenType == 2)
{
bResult = true;
}
else
{
bResult = false;
}
}
else
{
bResult = false;
}
return bResult;
}
}
}
//csharp/7099