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

float f( float x )
{
    if ( x < 0.0 )
       x = -x;
    return( sqrt( x ) );
}

int main()
{
    float w, y;
    
    w = -0.49;
    y = f(w);
    cout << "w = " << w << " and f(w) = " << y << endl;
            
    cout << "\n\n"; system( "PAUSE" );
    return( 0 );
}