uint8_t checksum = 0;
uint32_t id = 0xDEAD00;
checksum += (id >> 6) && 0xFF;

Line 1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'checksum'
Line 2: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'id'
Line 3: error: expected '=', ',', ';', 'asm' or '__attribute__' before '+=' token