Compilare: main.cpp: In function 'int main()': main.cpp:16:10: warning: variable 'x6' set but not used [-Wunused-but-set-variable] int x6 = 0; ^~ main.cpp:17:10: warning: variable 'x3' set but not used [-Wunused-but-set-variable] int x3 = 0; ^~ main.cpp:18:10: warning: unused variable 'x2' [-Wunused-variable] int x2 = 0; ^~ main.cpp:19:10: warning: unused variable 'x1' [-Wunused-variable] int x1 = 0; ^~