printf("Beginning with: (%n, %n)", clock[startIndex], clock[finishIndex]);

    clock[startIndex] = clock[startIndex] ^ clock[finishIndex];
    clock[finishIndex] = clock[startIndex] ^ clock[finishIndex];
    clock[startIndex] = clock[startIndex] ^ clock[finishIndex];

    printf("Ending with: (%n, %n)", clock[startIndex], clock[finishIndex]);