#include<stdio.h>
#include<stdlib.h>
#include<time.h> /* Utilisé pour obtenir une adresse de démarrage aléatoire */

union mars_instruction {
   long long instruction;
   struct 
   {
       unsigned char codeop;
       unsigned char modea;
       unsigned char modeb;
       unsigned char align;
       short int     arga;
       short int     argb;  
   } mars;
};


int main(int argc, char* argv[]){

    union mars_instruction toto;
    union mars_instruction didier;

    toto.instruction = 216173890264694884;

    didier.mars.codeop = 2;
    didier.mars.arga   = 2;
    didier.mars.argb   = 8;

    printf("Long long int: %lld\n", didier.instruction);
    printf("Argument b de toto: %d\n", toto.mars.argb);

}