Compilare: user.cpp: In function ‘int main()’: user.cpp:144:9: warning: variable ‘x’ set but not used [-Wunused-but-set-variable] int x,y; ^ user.cpp:144:11: warning: variable ‘y’ set but not used [-Wunused-but-set-variable] int x,y; ^ user.cpp:146:12: warning: unused variable ‘p2’ [-Wunused-variable] int p1,p2; ^ user.cpp:162:16: warning: ‘p1’ may be used uninitialized in this function [-Wmaybe-uninitialized] ans+=p1; ^