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Hello, <br>
<br>
I try to make this exercise : <br>
<br>
<div class="SIntrapara"><a name="(counter._mix._(exercise._mix4))"></a><span
style="font-weight: bold;">Exercise</span> 76: A programmer has
chosen to represent locations as Cartesian points or just points:</div>
<div class="SIntrapara">
<blockquote class="SCodeFlow">
<table class="RktBlk" cellspacing="0">
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<td><span class="RktCmt">;</span><span class="RktCmt"> </span><span
class="RktCmt">Location is one of:</span></td>
</tr>
<tr>
<td><span class="RktCmt">;</span><span class="RktCmt"> </span><span
class="RktCmt">&#8211;</span><span class="RktCmt"> Posn</span></td>
</tr>
<tr>
<td><span class="RktCmt">;</span><span class="RktCmt"> </span><span
class="RktCmt">&#8211;</span><span class="RktCmt"> Number</span></td>
</tr>
<tr>
<td><span class="RktCmt">;</span><span class="RktCmt"> </span><span
class="RktCmt">interp. Posn are positions on the
Cartesian grid,</span></td>
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<tr>
<td><span class="RktCmt">;</span><span class="RktCmt"> </span><span
class="RktCmt">Numbers are positions on the number
line </span></td>
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</blockquote>
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<div class="SIntrapara">Design the function <span class="RktSym">in-reach</span>,
which determines whether or not a given location&#8217;s distance to the
origin is strictly less than some constant<span class="RktSym">R</span>.<br>
<br>
So I must design a function called in-reach.<br>
<br>
Am I right I need to use two structs (Posn) . One for the given
location and one for the origon ?<br>
<br>
Regards, <br>
<br>
Roelof<br>
<br>
<br>
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