Compilare: user.cpp: In function 'void read()': user.cpp:23: warning: format '%s' expects type 'char*', but argument 2 has type 'char (*)[260]' user.cpp:24: warning: format '%s' expects type 'char*', but argument 2 has type 'char (*)[260]' user.cpp: In function 'void variabile()': user.cpp:31: warning: unused variable 'max2' user.cpp: In function 'void polo()': user.cpp:113: warning: unused variable 'j'