Compilare: user.cpp: In function ‘int main()’: user.cpp:13:15: warning: unused variable ‘r’ [-Wunused-variable] int i,x,y,r,nr=0,ok,k=0,j; ^ user.cpp:17:20: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] op=sqrt(x*x+y*y); ^ user.cpp:17:24: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] op=sqrt(x*x+y*y); ^