Hello World #2

//helloworld.c
//Cinska polivka's first n00bish výtvor

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

int main(int argc, char **argv)
{

    char *arg = argv[1];
    //char b[] = "ahoj";
    char *p = arg;

    int i=0;
    int text;

    for(i=0; i < strlen(p); i++)
    {
        text = arg[i];
        if(text >= 'a' && text <= 'z')
        {
            text -= 84;
            text = text % 26 + 97;
        }
        else if(text >= 'A' && text <= 'Z')
        {
            text -= 52;
            text = text % 26 + 65;
        }
        printf("%c", (char)text);
    }
    printf("\n\n");
    return 0;
}