Compilare: user.cpp: In function 'int main()': user.cpp:55: warning: format '%d' expects type 'int', but argument 3 has type 'long int' user.cpp:55: warning: format '%d' expects type 'int', but argument 4 has type 'long int' user.cpp:17: warning: unused variable 'ok' user.cpp:16: warning: 'n2' may be used uninitialized in this function user.cpp:16: warning: 'n1' may be used uninitialized in this function