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];
    buffer[0]=0xA5;
    buffer[1]=command;
    buffer[2]=(((1U<<8)-1)&value);
    buffer[3]=(((((1U<<8)-1)<<8)&value)>>8);
    buffer[4]=status;
    buffer[5]=(((1U<<8)-1)&checksum);
    buffer[6]=(((((1U<<8)-1)<<8)&checksum)>>8);
    buffer[7]=(((((1U<<8)-1)<<16)&checksum)>>16);
    buffer[8]=(((((1U<<8)-1)<<24)&checksum)>>24);
    buffer[9]=0x5A;

    // Your logic to fill buffer
    // 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