Compilare: user.cpp: In function ‘int main()’: user.cpp:8: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:9: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:12: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:10: warning: ‘a1’ may be used uninitialized in this function user.cpp:10: warning: ‘a2’ may be used uninitialized in this function user.cpp:10: warning: ‘a3’ may be used uninitialized in this function user.cpp:10: warning: ‘b1’ may be used uninitialized in this function user.cpp:10: warning: ‘b2’ may be used uninitialized in this function user.cpp:10: warning: ‘b3’ may be used uninitialized in this function user.cpp:10: warning: ‘p’ may be used uninitialized in this function