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] = {0};

    // Your logic to fill buffer
    buffer[0] = 0xA5;
    buffer[1] |= (command & 0xFF); 
    buffer[2] |= (value & 0xFF);
    buffer[3] |= ((value >> 8) & 0xFF);
    buffer[4] = status;
    buffer[5] = (checksum & 0xFF);
    buffer[6] = ((checksum >> 8) & 0xFF);
    buffer[7] = ((checksum >> 16) & 0xFF);
    buffer[8] = ((checksum >> 24) & 0xFF);
    buffer[9] = 0x5A;
    // Then print buffer

    for(int 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;
}

Solving Approach