/*
 * This is a polished, corrected version of
 * <a href = "wrongo.c">~comp210/Labs/lab12/wrongo.c</a>.
 */
#include <stddef.h>     // get declaration of NULL
#include <stdio.h>      // get declaration of printf

int main() {
  double x;
  printf( "Enter a positive x, and I'll calculate how many doublings\n" );
  printf( "of 1 it takes until x is met or exceeded: " );
  scanf( "%lf", &x );
  
  int n = 1, doublings = 0;
  for ( bool notDoneYet = (x > 0);
        notDoneYet;
        notDoneYet = (n < x) ) {
    n *= 2;
    doublings++;
    }
    
  printf( "ceil(log_2(%g)) = %d.\n", x, doublings );
  return 0;
  }