Arthimatic with strings

[rishanth12]

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

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

[GReaper]

Is it that difficult to iterate an array?

[CommonTater]

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

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

See, not hard at all.

[rishanth12]

Perphaps i wasn't clear on what i was trying to do, sorry about that

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

[CommonTater]

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.

#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.