Compilare: user.cpp: In function ‘int lgput(int)’: user.cpp:25:39: warning: null argument where non-null required (argument 2) [-Wnonnull] memcpy(aux, 0, sizeof(aux)); ^ user.cpp:30:35: warning: null argument where non-null required (argument 2) [-Wnonnull] memcpy(aux, 0, sizeof(aux)); ^ user.cpp: In function ‘int main()’: user.cpp:39:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &k); ^