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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
    buffer[0]=0xA5;
    buffer[1]=command;
    unsigned char *ptr=(unsigned char *)(&value); //declaring a pointer which can store address of 16 bit or 32 bit variable.
    buffer[2]=*(ptr++); //As we are using post increment operator, we get initially 1 byte address.But for next instruction it points to latest address.
    buffer[3]=*ptr;
    buffer[4]=status;
    ptr=(unsigned char *)(&checksum);
    int i;
    for(i=0;i<4;i++)
    {
      buffer[5+i]=*(ptr++); //This is also same logic which is replicated for mapping 16 bit value into two 8 bits format.
    }
    buffer[9]=0x5A;
    // Then print buffer
    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;
}

Solving Approach

 

 

 

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Input

1 4660 1 2864434397

Expected Output

165 1 52 18 1 221 204 187 170 90