45. Serialized Data Buffer

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

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

    buffer[0] = 0xA5;
    buffer[9] = 0x5A;
    buffer[1] = command;
    buffer[2] = value & 0xFF;
    buffer[3] = (value >> 8) & 0xFF;
    buffer[4] = status;
    
    uint8_t *tmp = (uint8_t *)&checksum;
    int i = 0;
    while(i < 4)
    {
        buffer[i + 5] = tmp[i];
        i++;
    }
    
    for(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;
}