Compilare: user.cpp: In function 'int ext()': user.cpp:14: warning: no return statement in function returning non-void user.cpp: At global scope: user.cpp:17: warning: ISO C++ forbids declaration of 'main' with no type user.cpp: In function 'int main()': user.cpp:21: warning: format '%ld' expects type 'long int*', but argument 2 has type 'long long int*' user.cpp:21: warning: format '%ld' expects type 'long int*', but argument 3 has type 'long long int*' user.cpp:21: warning: format '%ld' expects type 'long int*', but argument 4 has type 'long long int*' user.cpp: In function 'int ext()': user.cpp:14: warning: control reaches end of non-void function