Compilare: user.cpp: In function 'int del(int, char*)': user.cpp:18: warning: statement has no effect user.cpp: In function 'int main()': user.cpp:42: warning: format '%ld' expects type 'long int', but argument 2 has type 'int' user.cpp:43: warning: format '%ld' expects type 'long int', but argument 2 has type 'int' user.cpp: In function 'int del(int, char*)': user.cpp:23: warning: control reaches end of non-void function