Serialized Data Buffer

Code

#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];

    // Your logic to fill buffer
    // Then print buffer
    buffer[0] = 0xa5;
    buffer[1] = command;
    buffer[2] = value & 0xff;
    buffer[3] = (value & 0xff00) >> 8;
    buffer[4] = status;
    buffer[5] = (checksum & 0xff);
    buffer[6] = (checksum & 0xff00) >> 8;
    buffer[7] = (checksum & 0xff0000) >> 16;
    buffer[8] = (checksum & 0xff000000) >> 24;
    buffer[9] = 0x5a;

    for (int i = 0; i < sizeof(buffer); i++) {
        if (i) printf(" ");
        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;
}

Solving Approach