Compilare: user.cpp: In function ‘void cit()’: user.cpp:20: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:23: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘void pr1()’: user.cpp:38: warning: array subscript has type ‘char’ user.cpp:40: warning: array subscript has type ‘char’ user.cpp: In function ‘void pre()’: user.cpp:59: warning: array subscript has type ‘char’ user.cpp:61: warning: array subscript has type ‘char’