Compilare: user.cpp: In function ‘int find(int)’: user.cpp:16: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int add(int)’: user.cpp:24: warning: no return statement in function returning non-void user.cpp: In function ‘int del(int)’: user.cpp:28: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result