Compilare: main.cpp: In function 'int main()': main.cpp:32:6: warning: unused variable 'x1' [-Wunused-variable] int x1, x2, y1, y2; ^~ main.cpp:32:10: warning: unused variable 'x2' [-Wunused-variable] int x1, x2, y1, y2; ^~ main.cpp:32:14: warning: unused variable 'y1' [-Wunused-variable] int x1, x2, y1, y2; ^~ main.cpp:32:18: warning: unused variable 'y2' [-Wunused-variable] int x1, x2, y1, y2; ^~