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locate an entry and related information in the file

Posted on 1998-06-17
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Last Modified: 2010-03-04
Hello,
Does any one have an good idea  to implement following question in perl effectively.
suppose there is a file the format is:

metrics        range

entry1           0-12
entry2           0-56
entry3           0.2-13.4
....
....

when the program gets an entry name and its value from user(e.g. "entry2   24"),it can locate this entry and its range in the file.Then check if the given value is within range. and report "success" or "fail" to the user.
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Question by:tian
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7 Comments
 
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Expert Comment

by:alamo
ID: 1207859
Before I give you some code, would you please confirm that this is not an assignment for any class? Posting class assignments is against EE rules.

(I haven't heard of any classes giving assignments in perl, but the nature of the problem and the way it's phrased is very assignment-like, and I am just making sure).

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Author Comment

by:tian
ID: 1207860
It's difinitely not.
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Author Comment

by:tian
ID: 1207861
It's difinitely not. In fact, I already implemented it:
read file one line at one time,then use "split" to parse it and commpare corresponding items with user input.....  
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Accepted Solution

by:
alamo earned 100 total points
ID: 1207862
Sorry about that then... here's my solution to it, based on the file format you posted.. if your solution is as good or better then just reject it and ask them to delete this question

open(IN, "<metrics.dta") || die("Open failed - $!\n");
while (<IN>) {
 chomp;
 # data format: <entryname>   <lowerbound>-<upperbound>
 if (/^([a-zA-Z0-9]+)\s+(-*[\d\.]+)-(-*[\d\.]+)\s*$/) {
  $lowerbound{$1}=$2;
  $upperbound{$1}=$3;
 }
 else {
  print "Bad line in metrics file, ignored: $_\n";
 }
}
close(IN);

Then the test routine:

sub TestMetric {
 my $value = pop;
 my $metric = pop;
 if (!exists $lowerbound{$metric}) {
  print "No metric '$metric' found\n";
 }
 elsif ($lowerbound{$metric} <= $value && $value <= $upperbound{$metric}) {
  print "true\n";
 }
 else {
  print "false\n";
 }
}

Hope this helps..
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Author Comment

by:tian
ID: 1207863
thank you very much.
 But how about if metric user given is just part of a compound metric in the file.
for example:

metric_name       range
-----------------------------------
m1                       1~12
m3+m4                23~34
m7                    45~23
.......
what the user input is " (m3  3),(m1 19), (m4 23)..." and the program can make a report indicate the "false" or true" for each metric entry in the file
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Author Comment

by:tian
ID: 1207864
Sould I post modified question again?
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Expert Comment

by:alamo
ID: 1207865
I just now saw your comments... yes, the new question is a different than this one because the compound metrics means you have to save the inputs and loop through the metrics, calculating each one. All the code changes.

I can't take a look at it quite at this moment unfortunately, if the new question is still unanswered later I will answer it, in any event good luck!
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