Compilare: user.cpp: In function ‘int main()’: user.cpp:24: warning: unused variable ‘B’ user.cpp:24: warning: unused variable ‘exp’ user.cpp:24: warning: unused variable ‘Nr’ user.cpp:24: warning: unused variable ‘D’ user.cpp:26: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:27: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result