Compilare: user.cpp: In function ‘void adauga(int)’: user.cpp:13: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void sterge(int)’: user.cpp:23: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘bool query(int)’: user.cpp:36: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:44: 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 ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result