Compilare: user.cpp: In function 'void iofile()': user.cpp:22: warning: format '%li' expects type 'long int*', but argument 3 has type 'long int' user.cpp:22: warning: format '%li' expects type 'long int*', but argument 4 has type 'long int' user.cpp: In function 'void prel()': user.cpp:68: warning: format '%li' expects type 'long int', but argument 3 has type 'double'