code: public static int recognizeVendor(long creditCardNumber) {
  	int i = findMatchingRange(creditCardNumber);
  	if (i < 0) {
  	    return i;
  	}
  	return ranges[i].vendor;
  
      }
docs: Determine the credit card company. Does NOT validate checkdigit.
  
  @param creditCardNumber number on card.
  
  @return credit card vendor enumeration constant.