mod256.cpp

#include <iostream>
uint8_t mod256(uint16_t value) {
    return static_cast<uint8_t>(value % 256);
}
int main() {
    uint16_t sum = 0x02+ 0x01+ 0x00+0xFF+ 0xFF;
    uint8_t result = mod256(sum);
    std::cout <<std::hex<< static_cast<int>(result) << std::endl;
    return 0;
}