Compilare: user.cpp: In function ‘int main()’: user.cpp:17:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(FIN, "r", stdin); ^ user.cpp:18:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(FOUT, "w", stdout); ^ user.cpp:27:46: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (str.clear(), scanf("%c", &c); c != '"'; scanf("%c", &c)) ^ user.cpp:27:13: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (str.clear(), scanf("%c", &c); c != '"'; scanf("%c", &c)) ^ user.cpp:35:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (scanf("%c", &c); c < 33; scanf("%c", &c)); ^ user.cpp:35:13: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (scanf("%c", &c); c < 33; scanf("%c", &c)); ^ user.cpp:38:50: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (str.clear(), scanf("%c", &c); c != '"'; scanf("%c", &c)) ^ user.cpp:38:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (str.clear(), scanf("%c", &c); c != '"'; scanf("%c", &c)) ^ user.cpp:41:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (str.clear(); c >= '0' && c <= '9'; scanf("%c", &c)) ^