Compilare: user.cpp: In function ‘int get(int, int, int)’: user.cpp:30: warning: comparison between signed and unsigned integer expressions user.cpp:28: warning: unused variable ‘nr’ user.cpp: In function ‘void add(sum2)’: user.cpp:45: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:60: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:61: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:63: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:67: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result