Cryptography. The science of developing secret codes has interested many people for centuries. Some of the simplest codes involve replacing a character, or a group of characters, with another character, or group of characters. To easily decode these messages, the decoder needs the “key” that shows the replacement characters. In recent times, computers have been used very successfully to decode many codes that initially were assumed to be unbreakable. The next set of problems considers simple codes and schemes for decoding them. Generate files to test the programs.
A simple code can be developed by replacing each character by another character that is a fixed number of positions away in the collating sequence. For example, if each character is replaced by the character that is two characters to the right, then the letter ‘a’ is replaced by the letter ‘c,’ the letter ‘b’ is replaced by the letter ‘d,’ and so on. Write a program that reads the text in a file, and then generates a new file that contains the coded text using this scheme. Do not change the newline characters or the EOF character.
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