Assignment

Question 1

Assume s is a string of numbers.

Write a program that checks the string s for the values '2', '3', '5' and '7'. When one of the values is found in the string, record its position within the string and continue to check for more occurrences. Finally, output the results found.

For example, if s = '568714523645873', your program should print:

2 - 7
3 - 8 14
5 - 0 6 11
7 - 3 13

Give Five (5) different examples with its output.

Question 2

Assume s is a string of numbers.

Write a program that prints the longest substring of s in which the numbers occur in descending order. For example, if s = '561984235870154755310', then your program should print

Longest substring in numeric descending order is: 755310

In the case of ties, print the first substring. For example, if s = '742951', then your program should print

Longest substring in numeric descendingorder is: 742

Question 3

You have recently returned to Australia after a holiday abroad. You have some unspent foreign currency that you need to convert back into AUD (Australian Dollars). Write a program that will allow you to enter two or more amounts of foreign currency and theirassociated exchange rate.

Convert the amounts back into AUD and print the total sum of AUD received once all conversions are complete.

Resulting program output might look similar to:

Enter currency amount: 100
Enter exchange rate: 0.75
100.0000 / 0.7500 = 133.33

Enter currency amount: 100
Enter exchange rate: 0.50
100.0000 / 0.5000 = 200.00

Total AUD received = $333.33

Question 4

Write a python program that allows the user to navigate the lines of text in a file. The program should prompt the user for a filename and input the lines of text into a list. The program then enters a loop in which it prints the number of lines in the file and prompts the user for a line number.

Actual line numbers range from 1 to the number of lines in the file. If the input is 0, the program quits. Otherwise, the program prints the line associated with that number.

Question 5

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 word that will be used for encryption/decryption. Each character of the user's input should be offset by the value of the same character in your secret word. For example, if my secret word is "cab" and the user wants to encrypt "apples".

c a b c a b
3 1 2 3 1 2

a p p l e s
1 16 16 12 5 19

4 17 18 15 6 21
d q r o f u

The encrypted output would be "dqrofu".
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): apples
Result: dqrofu

Enter phrase to Decrypt (lowercase, no spaces): dqrofu
Result: apples

Question 6

Write a python program that accepts a text file as input. The program should read the text file and display all unique words in alphabetical order.

It should then display the non-unique words and the number of times that they occurred in the input text.
Input file contains the following text:

how much wood would a woodchuck chuck if a woodchuck could chuck wood

Expected outcome should resemble:

Non-unique words and number of occurrences in no particular order:
wood : 2
a : 2
woodchuck : 2
chuck : 2

Unique words in alphabetic order:
could
how
if
much
would

!End!