Compilare: user.cpp: In function 'int main()': user.cpp:39: warning: format '%d' expects type 'int*', but argument 2 has type 'int' user.cpp:42: warning: format '%d' expects type 'int*', but argument 2 has type 'int' user.cpp:42: warning: format '%d' expects type 'int*', but argument 3 has type 'int' user.cpp:39: warning: 'n' is used uninitialized in this function user.cpp:42: warning: 'op' is used uninitialized in this function user.cpp:42: warning: 'x' is used uninitialized in this function