Compilare: user.cpp: In function ‘int main()’: user.cpp:57:19: warning: unused variable ‘e’ [-Wunused-variable] int n,i,d,x,b,e,m; ^ user.cpp: In function ‘int cb1(int, int*, int)’: user.cpp:37:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int cb2(int, int*, int)’: user.cpp:52:1: warning: control reaches end of non-void function [-Wreturn-type] } ^