union_packet_ipv4

#include <stdio.h>

union packet{
    unsigned int a;
    struct {
        unsigned char version : 4;
        unsigned char ihl : 4;
        unsigned char dscp : 6;
        unsigned char ecn : 2;
        unsigned short totallength : 16;
    }ipv4;
};

int main() {
    union packet P;
    printf("Enter int value: \n");
    scanf("%d", &P.a);
    printf("Version: %u \n", P.ipv4.version);
    printf("IHL: %u \n", P.ipv4.ihl);
    printf("DSCP: %u \n", P.ipv4.dscp);
    printf("ECN: %u \n", P.ipv4.ecn);
    printf("Total length: %u \n", P.ipv4.totallength);

    return 0;
}