Do you remember when you had problems with * and &? everybody has that kind of problems at least once when learning C, what about poiners to pointers? let's see...

/* abo4.c * * specially crafted to feed your brain by gera */ /* After this one, the next is just an Eureka! away */ extern system,puts; void (*fn)(char*)=(void(*)(char*))&system; int main(int argv,char **argc) { char *pbuf=malloc(strlen(argc[2])+1); char buf[256]; fn=(void(*)(char*))&puts; strcpy(buf,argc[1]); strcpy(pbuf,argc[2]); fn(argc[3]); while(1); }