Question
Please answer 1 and 2 code is provided (I need a flowchart and analysis) of my code I have provided. Analysis: Input: Process: Output: Design:
Please answer 1 and 2 code is provided (I need a flowchart and analysis) of my code I have provided.
- Analysis:
Input:
Process:
Output:
- Design: (flow chart)
Coding: copy your Java source program here
/*
* C201
*/
/**
*
* @author __
*/
import java.util.Scanner;
public class HW06A
{
public static void main(String[] args)
{
Scanner input = new Scanner(System.in); // Create a Scanner
// Prompt the user to enter a credit card number as a long integer
System.out.print("Enter a credit card number as a long integer: ");
long number = input.nextLong();
System.out.println(number + " is " + (isValid(number) ? "valid" : "invalid"));
}
// Return true if the card number is valid
public static boolean isValid(long number)
{
boolean valid =
(getSize(number) >= 13 && getSize(number) <= 16) &&
(prefixMatched(number, 4) || prefixMatched(number, 5) ||
prefixMatched(number, 37) || prefixMatched(number, 6)) &&
((sumOfDoubleEvenPlace(number) + sumOfOddPlace(number)) % 10 == 0);
return valid;
}
// Get the result from Step 2
public static int sumOfDoubleEvenPlace(long number)
{
int sum = 0;
String num = number + "";
for (int i = getSize(number) - 2; i >= 0; i -= 2) {
sum += getDigit(Integer.parseInt(num.charAt(i) + "") * 2);
}
return sum;
}
// Return this number if it is a single digit, otherwise,
//return the sum of the two digits
public static int getDigit(int number)
{
if (number < 9)
return number;
else
return number / 10 + number % 10;
}
// Return sum of odd-place digits in number
public static int sumOfOddPlace(long number)
{
int sum = 0;
String num = number + "";
for (int i = getSize(number) - 1; i >= 0; i -= 2)
{
sum += Integer.parseInt(num.charAt(i) + "");
}
return sum;
}
// Return true if the digit d is a prefix for number
public static boolean prefixMatched(long number, int d)
{
return getPrefix(number, getSize(d)) == d;
}
// Return the number of digits in d
public static int getSize(long d)
{
String num = d + "";
return num.length();
}
// Return the first k number of digits from number. If thenumber of digits in number is less than k, return number.
public static long getPrefix(long number, int k)
{
if (getSize(number) > k)
{
String num = number + "";
return Long.parseLong(num.substring(0, k));
}
return number;
}
}
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