Caesar

#include <stdio.h>
#include <stdlib.h>
#include <string.h>


 void CaesarCipher (char data[],int key){

        char char;
        int i;

        for(i=0;i<strlen(data);++i)
        {
            char = data[i];

            if(char>='a'&&char<='z')
            {
                char=char+key;

                if(char > 'z')
                {
                    char = char - 'z' + 'a' - 1;
                }

                data[i] = char;
            }

             else if(char>='A'&&char<='Z')
            {
                char = char + key;

                if(char > 'Z')
                {
                    char = char - 'Z' + 'A' - 1;
                }

                data[i] = char;
            }
        }

        printf("Mesajul criptat este: %s" , data);
    }

int main()
{
    char a[]={'a','n','a'};
    CaesarCipher (a, 3);
    return 0;
}