Compilare: user.cpp: In function ‘void read()’: user.cpp:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘bool ok(int)’: user.cpp:54: warning: right-hand operand of comma has no effect user.cpp: In function ‘void spate(int)’: user.cpp:92: warning: right-hand operand of comma has no effect