Compilare: In file included from /usr/include/c++/4.2/backward/fstream.h:31, from user.cpp:3: /usr/include/c++/4.2/backward/backward_warning.h:32:2: warning: #warning This file includes at least one deprecated or antiquated header. Please consider using one of the 32 headers found in section 17.4.1.2 of the C++ standard. Examples include substituting the <X> header for the <X.h> header for C++ includes, or <iostream> instead of the deprecated header <iostream.h>. To disable this warning use -Wno-deprecated. user.cpp:131:2: warning: no newline at end of file user.cpp: In function 'int number(char*)': user.cpp:41: warning: array subscript has type 'char' user.cpp: In function 'void back(int)': user.cpp:98: warning: array subscript has type 'char' user.cpp:100: warning: array subscript has type 'char' user.cpp: In function 'int main()': user.cpp:115: warning: unused variable 'q1' user.cpp:116: warning: unused variable 'q2' user.cpp:106: warning: unused variable 'j' user.cpp: In function 'int number(char*)': user.cpp:30: warning: 'r' may be used uninitialized in this function