Compilare: user.cpp: In function ‘int main()’: user.cpp:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:46: warning: ‘A’ may be used uninitialized in this function user.cpp:46: warning: ‘B’ may be used uninitialized in this function user.cpp:46: warning: ‘C’ may be used uninitialized in this function user.cpp:46: warning: ‘D’ may be used uninitialized in this function