How to read file into hash array ?

.NET C C++ CSS DBA General HTML Java JavaScript JSP JUnit MySQL Networking Oracle Perl Perl PHP PL/SQL RSS Software QA SQL Server Struts Unix Windows XHTML XML

Home Hot About Collections Index RSS Atom Ask

Tester Developer DBA Windows JAR DLL Files Certificates RegEx Links Q&A Biotech Phones Travel FAQ Forum

Home > Perl

✍: Guest

 
open(IN, "<name_file")
  or die "Couldn't open file for processing: $!";
while (<IN>) {
  chomp;
  $hash_table{$_} = 0;
}
close IN;

print "$_ = $hash_table{$_}\n" foreach keys %hash_table;

2013-09-10, 2352👍, 0💬

How do I sort a hash by the hash value?
How do I sort a hash by the hash value? Here's a program that prints the contents of the grades hash, sorted numerically by the hash value: #!/usr/bin/perl -w # Help sort a hash by the hash 'value', not the 'key'. to highest). sub hashValueAscendingNum { $grades{$a} <=> $grades{$b}; } ... 2013-09-10, 2327👍, 0💬

How to dereference a reference?
How to dereference a reference? There are a number of ways to dereference a reference. Using two dollar signs to dereference a scalar. $original = $$strref; Using @ sign to dereference an array. @list = @$arrayref; Similar for hashes. 2013-09-13, 2148👍, 0💬

What does `new $cur->{LINK}' do? (Assume the current package has no new() function of its own.)
What does `new $cur->{LINK}' do? (Assume the current package has no new() function of its own.) $cur->new()->{LI NK}The indirect object syntax only has a single token lookahead. That means if new() is a method, it only grabs the very next token, not the entire following expression. Thi... 2013-09-09, 2134👍, 0💬

What value is returned by a lone `return;' statement?
What value is returned by a lone `return;' statement? The undefined value in scalar context, and the empty list value () in list context. This way functions that wish to return failure can just use a simple return without worrying about the context in which they were called. 2013-09-11, 2117👍, 0💬

How do you find the length of an array?
How do you find the length of an array? $@array 2013-09-11, 2113👍, 0💬

What's the difference between /^Foo/s and /^Foo/?
What's the difference between /^Foo/s and /^Foo/? The second would match Foo other than at the start of the record if $* were set. The deprecated $* flag does double duty, filling the roles of both /s and /m. By using /s, you suppress any settings of that spooky variable, and force your carets and d... 2013-09-12, 2089👍, 0💬

Does Perl have reference type?
Does Perl have reference type? Yes. Perl can make a scalar or hash type reference by using backslash operator. For example $str = "here we go"; # a scalar variable $strref = \$str; # a reference to a scalar @array = (1..10); # an array $arrayref = \@array; # a reference to an array Note that the ref... 2013-09-12, 2066👍, 0💬

Why does Perl not have overloaded functions?
Why does Perl not have overloaded functions? Because you can inspect the argument count, return context, and object types all by yourself. In Perl, the number of arguments is trivially available to a function via the scalar sense of @_, the return context via wantarray(), and the types of the argume... 2013-09-06, 2028👍, 0💬

What does read() return at end of file?
What does read() return at end of file? 0 A defined (but false) 0 value is the proper indication of the end of file for read() and sysread(). 2013-09-09, 1976👍, 0💬

.NET C C++ CSS DBA General HTML Java JavaScript JSP JUnit MySQL Networking Oracle Perl Perl PHP PL/SQL RSS Software QA SQL Server Struts Unix Windows XHTML XML

Home Hot About Collections Index RSS Atom Ask

Tester Developer DBA Windows JAR DLL Files Certificates RegEx Links Q&A Biotech Phones Travel FAQ Forum

All rights in the contents of this web site are reserved by the individual author. fyicenter.com does not guarantee the truthfulness, accuracy, or reliability of any contents.