Compilare: user.cpp:95:2: warning: no newline at end of file user.cpp: In function 'char* tr(int)': user.cpp:49: warning: address of local variable 'a' returned user.cpp: In function 'char* dif(char*, char*)': user.cpp:93: warning: array subscript has type 'char' user.cpp:93: warning: array subscript has type 'char' user.cpp:80: warning: address of local variable 't' returned