Compilare: user.cpp: In function 'void read()': user.cpp:22: warning: format '%d' expects type 'int*', but argument 3 has type 'long int*' user.cpp: In function 'void write()': user.cpp:85: warning: format '%d' expects type 'int', but argument 3 has type 'long int' user.cpp: In function 'void read()': user.cpp:21: warning: 'j' may be used uninitialized in this function