1, <span class="keywordtype">float</span> z1, <span class="keywordtype">float</span> x2, <span class="keywordtype">float</span> y2, <span class="keywordtype">float</span> z2) 
<a name="l00101"></a>00101 {
<a name="l00102"></a>00102         <span class="keywordtype">float</span> xdif = x1 - x2 ;
<a name="l00103"></a>00103         <span class="keywordtype">float</span> ydif = y1 - y2 ;
<a name="l00104"></a>00104         <span class="keywordtype">float</span> zdif = z1 - z2 ;
<a name="l00105"></a>00105 
<a nam