<html><body><div style="text-align: left;"><br>
</div><div id="cdiv">Hi, I am freshman on this group. I think many of you can help me on programming scheme :)) because I am beginner but I can understand when I see how coded a question. and this helps me be good at scheme.<br>
<br>
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mso-para-margin-right:0cm;
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line-height:115%;
mso-pagination:widow-orphan;
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<![endif]-->> For example wanna make sth like that;<br>
<p class="MsoNormal">
> <br>
> ( </p>
<source>)<br>
> <br>
> ( )<br>
> Database:<br>
> <br>
> (define flights<br>
> ‘((f237 istanbul frankfurt 5)<br>
> (f220 newyork frankfurt 10)<br>
> (f225 newyork paris 15)<br>
> (f110 berlin moscow 6)<br>
> (f050 istanbul moscow 3)<br>
> (f105 frankfurt istanbul 5)<br>
> (f023 istanbul tehran 4)<br>
> (f338 tehran paris 7)<br>
> (f461 frankfurt paris 2)<br>
> (f173 frankfurt newyork 10)<br>
> (f290 paris newyork 15)<br>
> (f190 moscow paris 5)<br>
> (f320 paris tehran 7)<br>
> (f240 newyork moscow 18)))<br>
> <br>
> (define passengers<br>
> ‘((jake istanbul frankfurt)<br>
> (mike newyork istanbul)<br>
> (pier istanbul berlin)<br>
> (hans frankfurt moscow)<br>
> (john newyork istanbul)))<p></p>
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<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt"><span style="font-family:"Times New Roman","serif"">> I want to implement the
function find-flight which takes source and </span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt"><span style="font-family:"Times New Roman","serif"">> destination as input (2
parameters) and returns flight number as a<br>
> list with one element or nothing if no such flight exists.<br>
> <br>
> > (find-flight 'istanbul 'frankfurt)<br>
> (list 'f237)<br>
> > (find-flight 'tehran 'istanbul)<br>
> empty<br>
> <br>
> For example, I wanna implement the function shortest-travel which</span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt"><span style="font-family:"Times New Roman","serif"">> takes passenger as input and
returns a list of flight numbers which<br>
> is the travel alternative with the smallest total flight<br>
> time. Again, you do not need to consider travel alternatives with<br>
> more than one transit<br>
> <br>
> > (shortest-travel 'jake)<br>
> (list ‘f237)<br>
> > (shortest-travel 'john)<br>
> (list ‘f220 ‘f105)<br>
> > (shortes-travel 'pier)<br>
> (list 'f220 'f461)<br>
> <br>
> If you help me, you will make a great favour to me :))</span></p>
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