Compilare: user.cpp: In function ‘void read()’: user.cpp:30:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] c[++p] = m[p] = q; ^ user.cpp:30:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] c[++p] = m[p] = q; ^ user.cpp:30:30: warning: operation on ‘p’ may be undefined [-Wsequence-point] c[++p] = m[p] = q; ^ user.cpp:24:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "password.in", "r", stdin ); ^ user.cpp:28:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%c", &q ); ^ user.cpp: In function ‘void write()’: user.cpp:66:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "password.out", "w", stdout ); ^