/***********************
 *   CCard - methods to determine if a String of digits could be a valid
 *           credit card number, of various types. 
 *
 *   @author   your name here!
 *   @version  2019-Sep-??
 *   @see      https://www.radford.edu/~itec120/2019fall-ibarland/Homeworks/CCard/CCard.html
 *
 ***********************/

public class CCard extends Object120 {

    // This is a helper method.  The other methods
    // in this class can call it to strip dashes and spaces out of a String.
    // It takes a String that might have dashes and spaces in it, and it returns
    // a new String that is the same as the given String except it doesn't have
    // any dashes or spaces in it.
    static String withoutDashesAndSpaces(String s) {
    }

    // This helper method answers if the given String contains only digits.
    static boolean isAllDigits(String s) {
    }
    
    
    
    // This are the methods that will be tested to Grade HW3.
    // Therefore, do NOT change the method headers.
    
    /** Return whether `ccNum` is a valid Visa card-number.
     * All Visa card numbers start with a 4. New cards have 16 digits. Old cards have 13.
     * @return whether `ccNum` is a valid Visa card-number.
     * @param ccNum the credit-card-number to validate.
     */
    static boolean isValidVisa(String ccNum) {
    }
    
    
    /** Return whether `ccNum` is a valid AmEx (American Express) card-number.
     * All AmEx card numbers start with 34 or 37 and have 15 digits.
     * @return whether `ccNum` is a valid AmEx card-number.
     * @param ccNum the credit-card-number to validate.
     */
    static boolean isValidAmEx(String ccNum) {
    }
    
    
    /** Return whether `ccNum` is a valid Discover card-number.
     * All Discover card numbers begin with 6011 or 65. All have 16 digits.
     * @return whether `ccNum` is a valid Discover card-number.
     * @param ccNum the credit-card-number to validate.
     */
    static boolean isValidDiscover(String ccNum) {
    }
    
    /** Return whether `ccNum` is a valid card-number of any type (Visa, AmEx, Discover).
     * @return whether `ccNum` is a valid card-number of any type.
     * @param ccNum the credit-card-number to validate.
     */
    static boolean isValidCCard(String ccNum) {
    }

    
    /** Interactively prompt the user for a card-number, and report
     *  which card-type it is (if any).
     * @see      https://www.radford.edu/~itec120/2019fall-ibarland/Homeworks/CCard/CCard.html
     */
    public static void main( String[] args ) {
    }
    
}