hi can u help me in understanding this return function thing it is microcontrollers avr atmega 88 pa connceted with clock ds1307

@brief Convert from BCD to Binary @param in BCD input (00-99) @return Binary output Huint8 t ds1307 decodeBcd (uint8 t in) { return (in / 16) * 10 + in % 16); @brief Convert from Binary to BCD @param in Binary input (0-99) @return BCD output Fuint8 t ds1307 encodeBcd (uint8 t in) return ((in 10)