Eroare de compilare: user.cpp: In function ‘void read()’: user.cpp:20: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:21: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int power(unsigned int)’: user.cpp:38: error: new declaration ‘int power(unsigned int)’ user.cpp:6: error: ambiguates old declaration ‘unsigned int power(unsigned int)’ user.cpp:42: warning: comparison between signed and unsigned integer expressions