Arthimatic with strings

This is a discussion on Arthimatic with strings within the C Programming forums, part of the General Programming Boards category; So i have been developing some code, what i want to do is i have 2 arrays Code: int souce[255] ...

  1. #1
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    Arthimatic with strings

    So i have been developing some code, what i want to do is
    i have 2 arrays

    Code:
    int souce[255]
    int destination[255]
    what i want to do is go character by character and do some arthimathic on these chars and store that in the destination.

    any idea on how this can be done, i'm reluctant to post my code as this is meant to be a huge project, i'm just stuck on this part.
    its an encryption method
    thanks in advance
    Last edited by Salem; 09-22-2011 at 11:48 PM. Reason: Remove text from code tags

  2. #2
    Programming Wraith GReaper's Avatar
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    Is it that difficult to iterate an array?
    Devoted my life to programming...

  3. #3
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    As GReaper says this is butt simple stuff... loops and a bit of math...

    arrayB[i] = arrayA[i] + 13;

    See, not hard at all.

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    Perphaps i wasn't clear on what i was trying to do, sorry about that
    Code:
    char Source[255]
    char dest[255]
    for(i=1;i<255;i++){
    dest[i]=(source[i]*5)%8;
    i want to be able to something like that please help
    Thanks in advance
    Last edited by Salem; 09-22-2011 at 11:49 PM. Reason: fix code tags

  5. #5
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    Aside from a few missing semi-colons and mismatched brackets... you just did...

    Really it's just not that difficult...

    Although I should warn you that if that's an encryption algortythm your Source text would be unrecoverable since every character would be reduced to a value between 0 and 7 by the %8 operation... and there'd be no way to backtrack that to the original text.

    Code:
    #include <stdio.h>
    
    int main(void)
     {
       char Source[255];
       char dest[255] = {0};
       int length
    
       strcpy(Source, "Hello World");
       length = strlen(Source);
    
       for(i=0; i < length ;i++)
         {
           dest[i] = Source[i] + 13;  // simple ROT13 encryption
         }
    
       printf("%s \n", dest);
    
       return 0;
    }
    What you need to do is climb into a good book or tutorial on C ... read page by page, compile the examples, do the exercises... actually learn C ... you'll be glad you did.
    Last edited by CommonTater; 09-22-2011 at 11:49 PM.

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