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];
    uint8_t *p = &buffer[0];

    *p                = 0xA5;
    *(p+1)            = command;
    *(uint16_t*)(p+2) = value;
    *(p+4)            = status;
    *(uint32_t*)(p+5) = checksum;
    *(p+9)            = 0x5A; 

    // Your logic to fill buffer
    // Then print buffer
    while(p <= &buffer[9])
    {
        printf("%u ",*p);
        p+=1;
    }
}

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