Compilare: user.cpp: In function ‘int main()’: user.cpp:43:18: warning: unused variable ‘x1’ [-Wunused-variable] int x1=i, y1=j, xa=i, ya=j, xb=i, yb=j; ^ user.cpp:43:24: warning: unused variable ‘y1’ [-Wunused-variable] int x1=i, y1=j, xa=i, ya=j, xb=i, yb=j; ^ user.cpp:31:21: warning: unused variable ‘x’ [-Wunused-variable] int Vx,Vy,l9,c9,x,y,si=0,sj=0,k, num=0, nr=0; ^ user.cpp:31:23: warning: unused variable ‘y’ [-Wunused-variable] int Vx,Vy,l9,c9,x,y,si=0,sj=0,k, num=0, nr=0; ^ user.cpp:32:9: warning: unused variable ‘startx’ [-Wunused-variable] int startx,starty,stopx,stopy, DACA=1; ^ user.cpp:32:16: warning: unused variable ‘starty’ [-Wunused-variable] int startx,starty,stopx,stopy, DACA=1; ^ user.cpp:32:23: warning: unused variable ‘stopx’ [-Wunused-variable] int startx,starty,stopx,stopy, DACA=1; ^ user.cpp:32:29: warning: unused variable ‘stopy’ [-Wunused-variable] int startx,starty,stopx,stopy, DACA=1; ^ user.cpp:32:36: warning: variable ‘DACA’ set but not used [-Wunused-but-set-variable] int startx,starty,stopx,stopy, DACA=1; ^