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POCaesar cipher fails when output character is beyond 'z'
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  1. POCaesar cipher fails when output character is beyond 'z'
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    copied!<p>Just to be clear, I am asking this because I have tried it for about 1.5 hours and can't seem to get any results. I am not taking a programming class or anything but I have a lot of free time this summer and I am using a lot of it to learn python from this book. I want to know how I would complete this problem. </p> <p>The problem asks for you to create a program which runs a "caesar cipher" which shifts the ascii number of a character down by a certain key that you choose. For instance, if I wanted to write sourpuss and chose a key of 2, the program would spit out the ascii characters all shifted down by two. So s would turn into u, o would turn into q (2 characters down the ascii alphabet...). </p> <p>I could get that part by writing this program.</p> <pre><code>def main(): the_word=input("What word would you like to encode? ") key=eval(input("What is the key? ")) message="" newlist=str.split(the_word) the_word1=str.join("",the_word) for each_letter in the_word1: addition=ord(each_letter)+key message=message+chr(addition) print(message) main() </code></pre> <p>Running this program, you get the following:</p> <pre><code>What word would you like to encode? sourpuss What is the key? 2 uqwtrwuu </code></pre> <p>Now, the next question says that an issue arises if you add the key to the ascii number and that results in a number higher than 128. It asks you to create a program that implements a system where if the number is higher than 128, the alphabet would reset and you would go back to an ascii value of 0. </p> <p>What I tried to do was something like this: </p> <pre><code>if addition&gt;128: addition=addition-128 </code></pre> <p>When I ran the program after doing this, it didn't work and just returned a space instead of the right character. Any ideas? </p>
 

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