Compilare: user.cpp: In function ‘int expr0()’: user.cpp:23:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] while( !good[ s[p] ] ) ++p; ^ user.cpp: In function ‘int expr1()’: user.cpp:44:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] while( !good[ s[p] ] ) ++p; ^ user.cpp: In function ‘int expr2()’: user.cpp:69:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] while( !good[ s[p] ] ) ++p; ^ user.cpp: In function ‘int main()’: user.cpp:88:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("expresie2.in","r",stdin); ^ user.cpp:89:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("expresie2.out","w",stdout); ^ user.cpp:91:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",s); ^