Compilare: main.cpp: In function 'int main()': main.cpp:52:16: warning: unused variable 'p1' [-Wunused-variable] pt p1 = {xmin, ymin}; ^~ main.cpp:53:16: warning: unused variable 'p2' [-Wunused-variable] pt p2 = {xmin, ymax}; ^~ main.cpp:54:16: warning: unused variable 'p3' [-Wunused-variable] pt p3 = {xmax, ymin}; ^~ main.cpp:55:16: warning: unused variable 'p4' [-Wunused-variable] pt p4 = {xmax, ymax}; ^~