In C++, public means those members that are accessible from anywhere where the object is visible, private means that members are accessible only from within other members of the same class or from their friends. But in Qt, the difference in private slots and public slots seem not to exist.

noun. a narrow, elongated depression, groove, notch, slit, or aperture, especially a narrow opening for receiving or admitting something, as a coin or a letter. a place or position, as in a sequence or series: The program received a new time slot on the broadcasting schedule.

The random number generator is responsible for every result after a player pushes the button. A computer programmer at the factory programs the RNG or assigns it certain combinations for every situation that may occur on the reels. The RNG reacts immediately after the first coin is dropped into the slot machine.

Slot machine outcomes are determined unsing a Random Number Generator (RNG) which is a mathematically-based program that selects groups of numbers to determine which symbols are selected to produce a winning or losing outcome.