Compilare: user.cpp: In function ‘int main()’: user.cpp:11:9: warning: unused variable ‘xn’ [-Wunused-variable] int xn,yn,xs,ys,l,c; ^ user.cpp:11:12: warning: unused variable ‘yn’ [-Wunused-variable] int xn,yn,xs,ys,l,c; ^ user.cpp:11:15: warning: unused variable ‘xs’ [-Wunused-variable] int xn,yn,xs,ys,l,c; ^ user.cpp:11:18: warning: unused variable ‘ys’ [-Wunused-variable] int xn,yn,xs,ys,l,c; ^ user.cpp:11:21: warning: unused variable ‘l’ [-Wunused-variable] int xn,yn,xs,ys,l,c; ^ user.cpp:11:23: warning: unused variable ‘c’ [-Wunused-variable] int xn,yn,xs,ys,l,c; ^