Compilare: user.cpp: In member function ‘HugeN HugeN::operator+(HugeN)’: user.cpp:42:5: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In member function ‘HugeN HugeN::operator+=(const HugeN&)’: user.cpp:53:5: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:80:9: warning: unused variable ‘i’ [-Wunused-variable] int i, j; ^ user.cpp:80:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp:81:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("next.in", "r", stdin); ^ user.cpp:82:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("next.out", "w", stdout); ^ user.cpp:84:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld", &D); ^ user.cpp: In member function ‘void HugeN::read()’: user.cpp:65:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ /tmp/ccvPA8uK.o: In function `main': user.cpp:(.text.startup+0x63): warning: the `gets' function is dangerous and should not be used.