Homework SourseWrite a Java program that asks the user for a EAN13 and vali
Write a Java program that asks the user for a EAN13 and validates it as either correct or incorrect (display a message accordingly). Your program should continue to run, to validate multiple EAN13 numbers, until the user decides to exit the program, by entering \'Q\' or \'Quit\'.
Comment your code and use procedural decomposition problem solving techniques.
For more info on EAN13, see: http://en.wikipedia.org/wiki/International_Article_Number_(EAN) .
If EAN13 is 4006381333931 the check code is computed as follows:
The nearest multiple of 10 that is equal or higher than the sum, is 90. Subtract them: 90 - 89 = 1, this is the last digit of the barcode.
| First 12 digits of the barcode | 4 | 0 | 0 | 6 | 3 | 8 | 1 | 3 | 3 | 3 | 9 | 3 |
| Weights | 1 | 3 | 1 | 3 | 1 | 3 | 1 | 3 | 1 | 3 | 1 | 3 |
| Multiplied by weight | 4 | 0 | 0 | 18 | 3 | 24 | 1 | 9 | 3 | 9 | 9 | 9 |
| Sum | 89 |
Solution
import java.util.*;
class EAN13
{
public static void main (String[] args)
{
int digit,lastdigit,weight,diff,sum;
String option =\"yes\";
Scanner scan = new Scanner(System.in);
System.out.println(\"Enter the first 12 digits of EAN13\");
do
{
sum =0;
for(int i=1;i<=12;i++)
{
digit = scan.nextInt(); // input first 12 digits
if(i%2 == 0) // assign weights 3 to even digits and 1 to odd digits
weight = 3;
else
weight = 1;
sum = sum + digit*weight; // sum all the digits and their weights
}
System.out.println(\"sum = \"+sum);
System.out.println(\"Enter the last digit of EAN13\");
lastdigit = scan.nextInt();
diff = 10 - (sum % 10); // compute the difference of the sum and the nearest multiple of 10
if (diff == lastdigit) //validate using 13th digit in EAN13
System.out.println(\"EAN13 is validated and correct\");
else
System.out.println(\"EAN13 is not validated and is incorrect\");
System.out.println(\"Do you want to check another EAN13?\");
option = scan.next();
if(option.equals(\"Quit\"))
break;
}while(!option.equals(\"Quit\"));
}
}
output:
