Compilare: user.cpp: In function ‘int main()’: user.cpp:25:9: warning: unused variable ‘x1’ [-Wunused-variable] int x1=ve,y1=1,x2=e,y2=m; ^ user.cpp:25:15: warning: unused variable ‘y1’ [-Wunused-variable] int x1=ve,y1=1,x2=e,y2=m; ^ user.cpp:25:20: warning: unused variable ‘x2’ [-Wunused-variable] int x1=ve,y1=1,x2=e,y2=m; ^ user.cpp:25:25: warning: unused variable ‘y2’ [-Wunused-variable] int x1=ve,y1=1,x2=e,y2=m; ^