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ECE222(2007Fall)Prog8(CodeBreaking)

ECE222(2007Fall)Prog8(CodeBreaking) - Fall 2007 ECE 222...

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Fall 2007 ECE 222 System Programming Concepts 1 of 2 Lab 8 – Codebreaking In this lab, each student is to write two separate programs called prog8enc.c and prog8dec.c. The first program will be used to encode an ASCII text file and the second program will be used to decode an encoded file. prog8enc.c The first program should prompt for one word (string) at a time, encode it, and print out the encoded version. This should continue until the single symbol “ . ” is given as input, which should terminate the program. The program must accept a single command line argument defining the shift delta . The value of delta must be an integer between -9 and +9, inclusive. Only letter (upper and lower case) and numeric (0 through 9) symbols should be affected. All other symbols should pass through encryption and decryption unaffected. The shifting of a symbol should wrap-around its set. For example, the symbol a shifted -1 should become z . The symbol 9 shifted +1 should become 0 .
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