Compilare: user.cpp: In function ‘void citesc_cerc(cerc&)’: user.cpp:104:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d %d", &a.xc, &a.yc, &a.R); ^ user.cpp: In function ‘int main()’: user.cpp:178:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("cerc.in", "r", stdin); ^ user.cpp:179:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("cerc.out", "w", stdout); ^ user.cpp:181:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &n); ^