45. Serialized Data Buffer

#include <stdio.h>
#include <stdint.h>

#define START_offset       (0)
#define COMMAND_offset     (1)
#define VALUE_offset       (2)
#define STATUS_offset      (4)
#define CHECKSUM_offset    (5)
#define END_offset         (9)

void build_packet(uint8_t command, uint16_t value, uint8_t status, uint32_t checksum) {
    uint8_t buffer[10];

    // Your logic to fill buffer
    // Then print buffer
    *(buffer + START_offset) = 0xA5;
    *(buffer + COMMAND_offset) = command;
    *(uint16_t*)(buffer + VALUE_offset) = value;
    *(buffer + STATUS_offset) = status;
    *(uint32_t*)(buffer + CHECKSUM_offset) = checksum;
    *(buffer + END_offset) = 0x5A;

    for(uint8_t i = 0; i < 10; i++){
        printf("%d ", buffer[i]);
    }
}

int main() {
    uint8_t cmd, status;
    uint16_t val;
    uint32_t crc;

    scanf("%hhu %hu %hhu %u", &cmd, &val, &status, &crc);
    build_packet(cmd, val, status, crc);
    return 0;
}