/* POSTNET Barcodes (15 points)

Have you ever wondered why mail envelopes have barcodes printed on them? 

The United States Postal Service uses the POSTNET barcode to automate 
mail routing. The barcode encodes the zip code of the destination address 
as a sequence of long and short vertical bars. Here is an example


| | |  | |    ||  | |  | | |  | |  |  | ||  | |   ||
||||||||||||||||||||||||||||||||||||||||||||||||||||


There are several POSTNET versions. This problem only focuses on the "C" 
version, which uses 52 bars. Here is how it works.

Every POSTNET barcode starts and ends with a full bar. This is commonly 
referred to as the guard rail. The remaining bars are grouped into sections 
of 5, each representing a single digit in the code. The table shows the 
encoding for each individual digit. 

The first 9 digits represent the ZIP code (5 zip + 4 zip extension). 
The 10-th digit, often called the checksum digit, is not part of the zip 
code, but it is used for error detection in case the barcode is unreadable 
or damaged. The checksum digit is calculated based on the previous nine 
digits such that when all ten digits are added the result should be a multiple 
of 10. If the sum is already a multiple of 10 the checksum digit is 0.


Example: The barcode shown above encodes the zip code 55122-4428. 
Adding these nine digits we get 5+5+1+2+2+4+4+2+8=33. The tenth digit of 
the barcode must be 7, as 33+7=40 and 40 is a multiple of 10. 
In other words, 40%10=0. The figure below groups the individual digits. 

|  | |   | |     ||   | |   | |  |  |  |  |   | | |  |  |   | |
| ||||| ||||| ||||| ||||| ||||| ||||| ||||| ||||| ||||| ||||| |

    5     5     1     2     2     4     4     2     8     7



See also:  http://en.wikipedia.org/wiki/POSTNET


Write a complete C program that reads two ints from the keyboard. 
The first one represents the 5-digit zip code. The second one represents 
the 4-digit zip code extension. The program must print the POSTNET barcode 
for this 9-digit zip code using ASCII characters. You can use the '|' character 
to print a short vertical bar. Printing two of these on two consecutive lines 
will give you a long vertical bar. 

Here is an example of a sample run of the program:

Enter 5-digit zip code:  50014
Enter 4-digit extension: 1234

50014-1234 in POSTNET is


| | | ||   ||      || |  |   ||  | |  ||  |  |||   |
||||||||||||||||||||||||||||||||||||||||||||||||||||

*/
#include <stdio.h>
#include <stdlib.h>

void printRow1(int n)
{
	switch (n)
	{
		case 0: printf("||   "); break;
		case 1: printf("   ||"); break;
		case 2: printf("  | |"); break;
		case 3: printf("  || "); break;
		case 4: printf(" |  |"); break;
		case 5: printf(" | | "); break;
		case 6: printf(" ||  "); break;
		case 7: printf("|   |"); break;
		case 8: printf("|  | "); break;
		case 9: printf("| |  "); break;
		default: printf("Unexpected number %d\n", n);  break;
	}
	//printf(" "); //for debugging only
}

void printRow2(int n)
{
	printf("|||||");  // It is the same for all 
	//printf(" "); //for debugging only
}

int main()
{
	int zip;
	int ext; //zip_extension
	
	printf("Enter 5-digit zip code:  ");
	scanf("%d", &zip);
	
	printf("Enter 4-digit extension: ");
	scanf("%d", &ext);
	
	printf("\n%05d-%04d in POSTNET is\n\n\n", zip, ext); // print leading 0's as well
	
	// extract the individual digits of the zip and ext
	int z1, z2, z3, z4, z5;
	z5= zip%10;  	zip/=10;
	z4= zip%10;  	zip/=10;
	z3= zip%10;  	zip/=10;
	z2= zip%10;  	zip/=10;
	z1= zip%10;
	
	int e1, e2, e3, e4;
	e4= ext%10;  	ext/=10;
	e3= ext%10;  	ext/=10;
	e2= ext%10;  	ext/=10;
	e1= ext%10;  	

	// calculate the checksum
	int checksum;
	int sum = z1+ z2+ z3+ z4+ z5 + e1+ e2+ e3+ e4;
	
	if(sum%10 == 0)
		checksum=0;  
	else
		checksum = 10 - sum%10;	
 
	// print 1st row
	printf("|"); // termination character
	printRow1(z1);
	printRow1(z2);
	printRow1(z3);
	printRow1(z4);
	printRow1(z5);
	printRow1(e1);
	printRow1(e2);
	printRow1(e3);
	printRow1(e4);
	printRow1(checksum);
	printf("|\n"); // termination character
		
	// print 2nd row
	printf("|"); // termination character
	printRow2(z1);
	printRow2(z2);
	printRow2(z3);
	printRow2(z4);
	printRow2(z5);
	printRow2(e1);
	printRow2(e2);
	printRow2(e3);
	printRow2(e4);
	printRow2(checksum);
	printf("|\n\n\n\n"); // termination character
	
	system("pause");
}