Hey bytes, you may or may not remember but last time I was here a few months ago I got some help with making a hangman program which went well. Now I'm still doing okay in Java this year but I'm starting a new project for simple encryption and decryption.
The way I set up the program to work is just to add 1 to each character to change a message... (example: "hello" becomes "ifmmp") or subtract 1 from each character to decrypt a message the user enters.
But doing the encryption that way has problems too. I want to have a range of numbres from 0-9, letters from a-z, and A-Z. The problem is if I have the letter z, it doesn't go back to a...which is logically correct since the next character in the unicode is {
Same with spaces. I want spaces to go ignored in the encrypted version of the message instead of becoming "!"...
Here is the code
- public static void encrypt()
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{
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System.out.println("Enter a message that you would like to encrypt\n");
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String s1=In.getString();
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char [] array = s1.toCharArray();
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for(int index=0; index<array.length; index++)
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{
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array[index]++;
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}
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String encrypted = new String(array);
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System.out.println("\nYour message has been encrypted to...\n");
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System.out.println(encrypted);
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In.getChar();
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clear();
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}
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public static void decrypt()
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{
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System.out.println("Please enter a message you would like to decrypt\n");
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String s2=In.getString();
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char [] array2 = s2.toCharArray();
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for (int index=0; index<array2.length; index++)
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{
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array2[index]--;
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}
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String decrypted = new String(array2);
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System.out.println("\nYour message has been decrypted to...\n");
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System.out.println(decrypted);
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In.getChar();
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clear();
I asked my teacher for a bit of help but I don't understand what his clues meant. He said something about the number 26 being important to this whole thing...can anyone help me make my program to encrypt letters to letters???
