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

int main (void) {
    char *string = "Testing Here";
    int nums[] = {7, 0, 0};
    int num_elems = 3;
    int i = 0;
    while (*string) {
        int newchar = *string;
        int caps = -1;
        /* Normalize A..Z to 0..25 */
        if ('A' <= newchar && newchar <= 'Z') {
            caps = 1;
            newchar -= 'A';
        }
        /* Normalize a..z to 0..25 */
        else if ('a' <= newchar && newchar <= 'z') {
            caps = 0;
            newchar -= 'a';
        }
        /* All other characters print it out without changing */
        else
            printf("%c", *string);
        /* If we set caps to 0 or 1, then we need to process this letter */
        if (caps != -1) {
            newchar += nums[i];
            while (newchar < 0)
                newchar += 26;
            while (25 < newchar)
                newchar -= 26;
            /* Set the character back to the proper ASCII value */
            newchar = newchar + 65 + (caps == 0 ? 32 : 0);
            printf("%c", newchar);
        }
        i++;
        if (num_elems <= i) i = 0;
        string++;
    }
    return 0;
}