Compilare: user.cpp: In function ‘void read()’: user.cpp:15: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:16: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result user.cpp:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘bool priority3()’: user.cpp:79: warning: array subscript has type ‘char’ user.cpp: In function ‘void print()’: user.cpp:91: warning: array subscript has type ‘char’ user.cpp:91: warning: array subscript has type ‘char’ user.cpp:88: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result