... ( c h a r *)0); execlp(const char *file, const char * a r g , ( c h a r *)0); execle(const char *path, const char * a r g , ( c h a r *)0, const char *envp[]); execv(const char *path, const char ... tiên trình với quan hệ cha sau: a A -> B -> c -> D : t c A cha B, B cha c, c cha D b A -> (B, c, D ) : t c A cha B, c, D c Xây dựng chu trình sau: //a Int main() { Pid_t pA, pB, pC,pD; pB = fork(); ... strcpy(countries[*countr:es_num].name, country_name); strcpy (countries [*countnes_num] capital_city, capital_city); strcpy (countries [*countnes_num] currency, currency); countries [*countries_nurrf population = population; (*countries_num)++;...