Below is the CustomerNumber Program. In the attached pictures is the assignment I am struggling with.
Below is the CustomerNumber Program. In the attached pictures is the assignment I am struggling with.
Chapter5: Making Decisions
Section: Chapter Questions
Problem 5PE
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Question
Below is the CustomerNumber Program. In the attached pictures is the assignment I am struggling with.
import java.util.Scanner;
/** * This program tests a customer number to determine
* whether it is in the proper format.
*/
public class CustomerNumber
{
public static void main(String[] args)
{
String customer; // To hold a customer number
// Create a Scanner object for keyboard input.
Scanner keyboard = new Scanner(System.in);
System.out.println("Enter a customer number in " + "the form LLLNNNN"); System.out.print("(LLL = letters and NNNN " + "= numbers): ");
// Get a customer number from the user.
customer = keyboard.nextLine();
// Determine whether it is valid. if (isValid(customer))
{
System.out.println("That's a valid customer " + "number.");
}
else
{
System.out.println("That is not the proper " + "format."); System.out.println("Here is an example: " + "ABC1234");
}
}
/** * The isValid method accepts a String as its argument
* and tests its contents for a valid customer number.
*/
private static boolean isValid(String custNumber)
{
boolean goodSoFar = true; // Flag
int index = 0; // Loop control variable
// Is the string the correct length?
if (custNumber.length() != 7)
goodSoFar = false;
// Test the first three characters for letters.
while (goodSoFar && index < 3)
{
if (!Character.isLetter(custNumber.charAt(index)))
goodSoFar = false;
index++;
} // Test the last four characters for digits. while (goodSoFar && index < 7) { if (!Character.isDigit(custNumber.charAt(index))) goodSoFar = false; index++; } // Return the results return goodSoFar; }}
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