Compilare: user.cpp: In function ‘void transform(std::string, int, int)’: user.cpp:26: warning: array subscript has type ‘char’ user.cpp:34: warning: array subscript has type ‘char’ user.cpp:36: warning: array subscript has type ‘char’ user.cpp:36: warning: array subscript has type ‘char’ user.cpp:37: warning: array subscript has type ‘char’ user.cpp: In function ‘int main()’: user.cpp:52: warning: array subscript has type ‘char’ user.cpp:55: warning: array subscript has type ‘char’ user.cpp:85: warning: array subscript has type ‘char’ user.cpp:87: warning: array subscript has type ‘char’