Compilare: user.cpp: In function ‘int main()’: user.cpp:8:9: warning: unused variable ‘n’ [-Wunused-variable] int n,r=1,a,b,x,y; ^ user.cpp:8:19: warning: variable ‘x’ set but not used [-Wunused-but-set-variable] int n,r=1,a,b,x,y; ^ user.cpp:8:21: warning: variable ‘y’ set but not used [-Wunused-but-set-variable] int n,r=1,a,b,x,y; ^