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Hello, <br>
<br>
I have to find the center of 2 points as a assigment for a course on
fpcomplete. This is no homework because I do a self-study. <br>
<br>
So I did this: <br>
<br>
center (x1,y1) (x2,y2) = ( ((x1+x2)/2),((y1+y2)/2) )<br>
main = print $ center ((1,2), (3, 4))<br>
<br>
but now I see this error message : <br>
<span class=".ide-help-icon"></span>
<div class="ui-resizable" id="ide-interaction-panel" style="left:
238px;">
<div class="ide-interaction-tab" id="ide-interaction-messages"
style="display: block;">Main.hs@2:8-2:13
<ul id="ide-interaction-messages-list">
<li class="ide-errors-list">
<div class="ide-error">
<div class="ide-error-msg">No instance for (Show (((t0,
t1), (t2, t3)) -> ((t0, t1), (t2, t3)))) arising from
a use of `print'
Possible fix: add an instance declaration for (Show
(((t0, t1), (t2, t3)) -> ((t0, t1), (t2, t3))))
In the expression: print
In the expression: print $ center ((1, 2), (3, 4))
In an equation for `main': main = print $ center ((1,
2), (3, 4))</div>
</div>
</li>
</ul>
</div>
</div>
Roelof<br>
<br>
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