该计划的要求如下：

1. Read a file (containing data about Atoms) from the command line & create an array of atom records (one record/atom per newline). For each record the program will need to store:

   • The atom’s serial number (cols 7 – 11)
   • The three-letter name of the amino acid to which it belongs (cols 18 – 20)
   • The atom’s three coordinates (x,y,z) (cols 31 – 54 )
   • The atom’s one- or two-letter element name (e.g. C,O,N,Na) (cols 77-78 )

   >提示三个命令之一：频率,长度,密度d(d是某个数字)：
   
   

   • freq – how many of each type of atom is in the file (example Nitrogen,Sodium,etc would be displayed like this: N: 918 S: 23
   • length – The distances among coordinates
   • density d (where d is a number) – program will prompt for the name of a file to save computations to and will containing the distance between that atom and every other atom. If that distance is less than or equal to the number d,it increments the count of the number of atoms that are within that distance,unless that count is zero into the file. The output will look something like:
   1: 5
   2: 3
   3: 6
   … (very big file) and will close when it finishes.

   我正在寻找下面代码中我写的(并且需要写)的反馈.我特别感谢有关如何编写我的潜艇的任何反馈.我在底部包含了示例输入数据.

   我看到的程序结构和功能描述：

   $^W = 1; # turn on warnings
   use strict; # behave!
   
   my @fields;
   my @recs;
   
   while ( <DATA> ) {
    chomp;
    @fields = split(/\s+/);
    push @recs,makeRecord(@fields);
   }
   
   for (my $i = 0; $i < @recs; $i++) {
    printRec( $recs[$i] );
   }
       my %command_table = (
    freq => \&freq,length => \&length,density => \&density,help => \&help,quit => \&quit
    );
   
   print "Enter a command: ";
   while ( <STDIN> ) {
    chomp; 
    my @line = split( /\s+/);
    my $command = shift @line;
    if ($command !~ /^freq$|^density$|length|^help$|^quit$/ ) {
       print "Command must be: freq,length,density or quit\n";
       }
     else {
       $command_table{$command}->();
       }
    print "Enter a command: ";
    }
   
   sub makeRecord 
       # Read the entire line and make records from the lines that contain the 
       # word ATOM or HETATM in the first column. Not sure how to do this:
   {
    my %record = 
    (
    serialnumber => shift,aminoacid => shift,coordinates => shift,element  => [ @_ ]
    );
    return\%record;
   }
   
   sub freq
       # take an array of atom records,return a hash whose keys are 
       # distinct atom names and whose values are the frequences of
       # these atoms in the array.  
   
   sub length
       # take an array of atom records and return the max distance 
       # between all pairs of atoms in that array. My instructor
       # advised this would be constructed as a for loop inside a for loop. 
   
   sub density
       # take an array of atom records and a number d and will return a
       # hash whose keys are atom serial numbers and whose values are 
       # the number of atoms within that distance from the atom with that
       # serial number. 
   
   sub help
   {
       print "To use this program,type either\n","freq\n","length\n","density followed by a number,d,\n","help\n","quit\n";
   }
   
   sub quit
   {
    exit 0;
   }
   
   # truncating for testing purposes. Actual data is aprox. 100 columns 
   # and starts with ATOM or HETATM.
   __DATA__
   ATOM   4743  CG  GLN A 704      19.896  32.017  54.717  1.00 66.44           C  
   ATOM   4744  CD  GLN A 704      19.589  30.757  55.525  1.00 73.28           C  
   ATOM   4745  OE1 GLN A 704      18.801  29.892  55.098  1.00 75.91           O