Area Calc
You are painting a wall. The instructions on the paint can says that 1 can of paint can cover 5 square meters of wall. Given a random height and width of wall, calculate how many cans of paint you'll need to buy.
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number of cans = (wall height x wall width) ÷ coverage per can.
e.g. Height = 2, Width = 4, Coverage = 5
number of cans = (2 x 4) ÷ 5 = 1.6 = 1.6
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Because you can't buy 0.6 of a can of paint, the result should be rounded up to 2 cans.
Prime Number
A Prime number can only be cleanly divided by itself and 1. For more information: https://en.wikipedia.org/wiki/Prime_number
This program checks whether or not a number is prime:
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2 is a prime number because it's only divisible by 1 and 2.
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4 is not a prime number because you can divide it by 1, 2 or 4.
Caesar cipher
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In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet. For example, with a left shift of 3, D would be replaced by A, E would become B, and so on. The method is named after Julius Caesar, who used it in his private correspondence.
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Deciphering is done in reverse, with a right shift of 3.
This program was developed in steps by breaking it down in small TODO tasks which were identified in the flow chart.
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The user chooses whether to encrypt or decrypt and the cipher key is entered. The program will run again if the user wants to en/decrypt something else.
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The module art.py is in this repository - ASCII art needed for the program to run.