Compilare: user.cpp: In function ‘void ReadVariables()’: user.cpp:43:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d\n", &n); ^ user.cpp:47:45: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets (sir + 1), L = strlen (sir + 1); ^ user.cpp: In function ‘int main()’: user.cpp:146:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("eval.in", "r", stdin); ^ user.cpp:147:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("eval.out", "w", stdout); ^ user.cpp:151:15: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets (sir + 1); ^ /tmp/ccAK8ize.o: In function `ReadVariables()': user.cpp:(.text+0x2a9): warning: the `gets' function is dangerous and should not be used.