Compilare: user.cpp: In function ‘int main()’: user.cpp:135:13: warning: variable ‘v’ set but not used [-Wunused-but-set-variable] int v, x, y, k; ^ user.cpp:135:16: warning: variable ‘x’ set but not used [-Wunused-but-set-variable] int v, x, y, k; ^ user.cpp:135:19: warning: variable ‘y’ set but not used [-Wunused-but-set-variable] int v, x, y, k; ^ user.cpp:135:22: warning: variable ‘k’ set but not used [-Wunused-but-set-variable] int v, x, y, k; ^