manipulating strings

This is a discussion on manipulating strings within the C++ Programming forums, part of the General Programming Boards category; Can someone give me a hint on how to start. Im working within visual studio c++ 2003 obtain a word/sentence ...

  1. #1
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    manipulating strings

    Can someone give me a hint on how to start. Im working within visual studio c++ 2003

    obtain a word/sentence (up to 80 characters) with spaces from the user

    2 fuctions:

    1. encrypt the word/sentence

    2. decrypt the word/sentence

    display both the encrypt and decrypt word/sentence

    loop if they want to enter another

  2. #2
    ~viaxd() viaxd's Avatar
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    1. encrypt the word/sentence

    2. decrypt the word/sentence
    What kind of encryption ?

  3. #3
    Code Goddess Prelude's Avatar
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    >1. encrypt the word/sentence
    >2. decrypt the word/sentence
    It doesn't even have to be two functions.
    Code:
    void cryptykins ( string& s, unsigned key )
    {
      for ( int i = 0; i < s.length(); i++ )
        s[i++] ^= key;
    }
    More or less.
    My best code is written with the delete key.

  4. #4
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    nope need 2 functions

  5. #5
    Code Goddess Prelude's Avatar
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    >nope need 2 functions
    Try it and see. XOR encryption can be implemented using only one function for both purposes. But if your teacher insists that you have two functions you can do this:
    Code:
    void encrypt ( string& s, unsigned key )
    {
      for ( int i = 0; i < s.length(); i++ )
        s[i++] ^= key;
    }
    
    void decrypt ( string& s, unsigned key )
    {
      for ( int i = 0; i < s.length(); i++ )
        s[i++] ^= key;
    }
    My best code is written with the delete key.

  6. #6
    and the hat of wrongness Salem's Avatar
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    Surely this would add to the teacher confusion
    Code:
    void decrypt ( string& s, unsigned key )
    {
      encrypt( s, key );
    }
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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