Compilare: user.cpp: In function ‘int smax()’: user.cpp:17: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:43: warning: unused variable ‘ch’ user.cpp:44: warning: unused variable ‘nr’ user.cpp:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:45: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result /tmp/cctK1qZ1.o: In function `main': user.cpp:(.text+0x3db): warning: the `gets' function is dangerous and should not be used.