Answered: The barcode used by the U.S. Postal…

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Problem Statement

The barcode used by the U.S. Postal System to route mail is defined as follows: Each decimal digit in the ZIP code is encoded using a sequence of three half-height and two full-height bars. The barcode starts and ends with a full-height bar (the guard rail) and includes a checksum digit (after the five-digit ZIP code or ZIP + 4), computed by summing up the original digits modulo 10.

Define the following functions:

Draw a half-height or full-height bar on stddraw.
Given a digit, draw its sequence of bars.
Compute the checksum digit.

Also define global code that read in a five- (or nine-) digit ZIP code as the command-line argument and draws the corresponding postal barcode.

Expert Solution

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Answer

Total answers posted by the expert is: 1055

Step 1

"""This program is written in python3
        program for printing postal barcode"""

# defining printDigit function
# printDigit takes a digit as argument and prints the barcode form of that digit        
def printDigit(d):
        # checking which digit is passed as argument and priting its corresponding barcode
        if(d=="1"):
                print(":::||",end="")
        elif(d=="2"):
                print("::|:|",end="")
        elif(d=="3"):
                print("::||:",end="")
        elif(d=="4"):
                print(":|::|",end="")
        elif(d=="5"):
                print(":|:|:",end="")
        elif(d=="6"):
                print(":||::",end="")
        elif(d=="7"):
                print("|:::|",end="")
        elif(d=="8"):
                print("|::|:",end="")
        elif(d=="9"):
                print("|:|::",end="")
        elif(d=="0"):
                print("||:::",end="")                                           
        
# defining printBarcode function
# printBarcode function takes zipcode as argument and calls printDigit function for every digit in zipcode using for loop       
def printBarcode(zipcode):
        for i in zipcode:
                printDigit(i)
                                
# defining main function                
def main():
        # invalid variable is used as a flag variable to decide whether the while should run or not
        invalid=True  
        while(invalid):
                zipcode=input("Enter 5 digit zipcode:")
                # len() function returns the length of an iterable
                # here len(zipcode) returns the length of the zipcode
                # isnumeric is a string method returns True if the string is numeric otherwise returns False
                # checking if the zipcode entered by user is valid or not
                if(len(zipcode)==5 and zipcode.isnumeric()):
                        invalid=False    # setting invalid value to False if zipcode entered by user is correct
                else:
                        print("Wrong input")
        print("|",end="")       # printing starting frame bar
        printBarcode(zipcode) #priting barcode for given zipcode
        # calculating check digit
        sum=0
        for i in zipcode:
                sum+=int(i)
        if sum%10==0:     
                check_digit=0
        else:
                check_digit=10-sum%10
        # here str function converts passed integer into string format
        # check digit is converted into int because in printDigit function digit is checked is using string comparison
        printDigit(str(check_digit)) # printing checkdigit using print digit function

        print("|")       # printing ending frame bar


if __name__=="__main__":
        # if this python file is imported as module main function will not be called
        # if this python file is executed as main file then main function will be called
        main()

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