/*  This program illustrates the loss of significant digits
that can occur when nearly equal quantities are subtracted.
The results of this program are terribly inaccurate.  */

#include <iostream>
#include <cmath>
using namespace std;

float f( float x )
{
   return( (1.0F - cos(x)) / (x*x) );
}

int main()
{
   float x = 0.1;
   
   cout << x << ",  " << f(x) << endl;
   x = 0.01;
   cout << x << ",  " << f(x) << endl;
   x = 0.001;
   cout << x << ",  " << f(x) << endl;
   x = 0.0001;
   cout << x << ",  " << f(x) << endl;
   x = 0.00001;
   cout << x << ",  " << f(x) << endl;
      
   cout << "\n\n"; system( "PAUSE" );  // This line is system dependent
   return( 0 );
}