double ch=0; cin>>ch; for(int i=0;i<10;++i){ cout<<ch<<" * " << i <<" = " << ch*i; }
#define pi 3.141592 double r=0; cin>>r; cout<<"S = " << (r*r)*pi;
#define pi 3.141592 double r=0; cin>>r; cout<<"P = " << (pi*2)*r;