//	Ex450.cc

//	Sec. 4.5 of lecture
//	WHILE-loop
//				Example : Binary log. of a number

#include <iostream.h>

main()
{
 double x,xsave;
 int    cnt;
 
 cout << endl << " Eingabe x : " ;
 cin  >> x;
 xsave = x;				// Save to restore x

 cnt = 0;				// Initialize  cnt	// Vergessen!
 while ( x > 1.0 )
   {
     x   = x/2.0 ;
     cnt = cnt + 1;
   }

 cout << endl << "Binary log. of " << xsave << " = " << cnt << endl;
  
}