Compilare: user.cpp: In function ‘int main()’: user.cpp:8:9: warning: unused variable ‘v’ [-Wunused-variable] int v,i,sy=0,s,ysize,xsize; ^ user.cpp:8:20: warning: unused variable ‘ysize’ [-Wunused-variable] int v,i,sy=0,s,ysize,xsize; ^ user.cpp:8:26: warning: unused variable ‘xsize’ [-Wunused-variable] int v,i,sy=0,s,ysize,xsize; ^