HIT137 Assignment 1, 2020

How to submit this assignment Your submission should be written in a single PY file.

Save the py file using your lastname_firstname.py for example: Azam_Sami.py

Put all the solutions in one single PY file and then you can use Case-Switch statement to allow the user to select which program should run first. I will show you how to use Case-Switch statement in the coming class. It is easy to use and gives you the flexibility to put your all solutions in one PY file.

Clearly label each question and any sub-sections. Provide maximum possible comments so the code becomes easier to read. If your submission is difficult to understand, you will lose marks. IMPORTANT TO NOTE: DO NOT use functions / commands to solve problems which were not taught in the class.

Question 1 Marks 6 Assume s is a string.

Write a program that prints a substring of numbers, the longest substring of s in which the numbers occur in descending order and compute the average of the numbers found. For example, if s = ’56aaww1984sktr235270aYmn145ss785fsq31D0′, then your program should print.

Keep in mind – you need to accept the string from the user.

Sample Input / Output

String of numbers: ‘561984235270145785310’

Create PDF in your applications with the Pdfcrowd HTML to PDF API PDFCROWD

Longest substring in numeric descending order is: 014578

Average: 4.167

In the case of ties, print the first substring. For example, if s = ’14erq72lkm79′, then your program should print

String of numbers: ‘147279’

Longest substring in numeric descending order is: 147

Average: 4

Question 2 Mark 6 Write a program that encrypts and decrypts the user input. Note – Your input should be only lowercase characters with no spaces.

Your program should have a secret distance given by the user that will be used for encryption/decryption. Each character of the user’s input should be offset by the distance value given by the user

For Encryption:

 Take the string and reverse the string.  Encrypt the reverse string with each character replaced with distance value (x) given by the user.

For Decryption:

 Take the string and reverse the string.  Decrypt the reverse string with each character replaced with distance value (x) given by the user.

Sample:

String input – cdu

Create PDF in your applications with the Pdfcrowd HTML to PDF API PDFCROWD

Encryption process – udc -> xgf (encrypted)

The program should ask the user for input to encrypt, and then display the resulting encrypted output. Next your program should ask the user for input to decrypt, and then display the resulting decrypted output.

Enter phrase to Encrypt (lowercase, no spaces): cdu

Enter distance value: 3

Result: xgf

Enter phrase to Decrypt (lowercase, no spaces): xgf

Enter distance value: 3

Result: cdu

Question 3 Mark 12 There is a file attached with your assignment, named mailbox-short.txt.

Write a program to prompt for a file name, and then read through the file and look for lines of the form:

X-DSPAM-Confidence: 0.8475

When you encounter a line that starts with “X-DSPAM-Confidence:” pull apart the line to extract the floating-point number on the line. Count these lines and then compute the total of the spam confidence values from these lines. When you reach the end of the file, print out the average spam confidence.

Your sample output of the program should be:

Enter the file name: mailbox-short.txt

Create PDF in your applications with the Pdfcrowd HTML to PDF API PDFCROWD

Average spam confidence: 0.894128046745

The End!!!

Create PDF in your applications with the Pdfcrowd HTML to PDF API PDFCROWD

Our website has a team of professional writers who can help you write any of your homework. They will write your papers from scratch. We also have a team of editors just to make sure all papers are of HIGH QUALITY & PLAGIARISM FREE. To make an Order you only need to click Ask A Question and we will direct you to our Order Page at WriteEdu. Then fill Our Order Form with all your assignment instructions. Select your deadline and pay for your paper. You will get it few hours before your set deadline.

Do you need help with this question?

Get assignment help from WriteEdu.com Paper Writing Website and forget about your problems.

WriteEdu provides custom & cheap essay writing 100% original, plagiarism free essays, assignments & dissertations.

With an exceptional team of professional academic experts in a wide range of subjects, we can guarantee you an unrivaled quality of custom-written papers.

Chat with us today! We are always waiting to answer all your questions.

Click here to Place your Order Now