#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;
}
Input
1 4660 1 2864434397
Expected Output
165 1 52 18 1 221 204 187 170 90