Compilare: user.cpp: In function ‘int main()’: user.cpp:19: warning: array subscript has type ‘char’ user.cpp:19: warning: array subscript has type ‘char’ user.cpp:20: warning: array subscript has type ‘char’ user.cpp:20: warning: array subscript has type ‘char’ user.cpp:21: warning: array subscript has type ‘char’ user.cpp:21: warning: array subscript has type ‘char’ user.cpp:22: warning: array subscript has type ‘char’ user.cpp:22: warning: array subscript has type ‘char’ user.cpp:17: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result