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HW4.pm
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####################################################
# Subroutine writeHash
####################################################
# Parameter
# Reference to a hash
# File name to write
# Return
# Writes the sorted hash to a file
####################################################
use strict;
use warnings;
sub writeHash{
my ($refHash, $file) = @_;
open(FH, ">$file")||die "can't open file $file";
foreach my $key (sort keys %$refHash){
print FH "$key\t$$refHash{$key}\n";
}
close FH;
}
####################################################
# Subroutine printHash
####################################################
# Parameter
# Reference to a hash
# Return
# Writes the sorted hash to screen
####################################################
sub printHash{
my ($refHash) = @_;
my %hash=%$refHash;
foreach my $key (sort keys %hash){
print "$key\t$$refHash{$key}\n";
}
}
sub printHashUnSort{
my ($refHash) = @_;
my %hash=%$refHash;
foreach my $key (keys %hash){
print "$key\t$$refHash{$key}\n";
}
}
####################################################
# Subroutine writeArray
####################################################
# Parameter
# Reference to an array
# File name to write
# Return
# Writes the sorted array to a file
####################################################
sub writeArray{
my ($refArray, $file) = @_;
open(FH, ">$file")||die "can't open file $file";
foreach my $element (sort @$refArray){
print FH "$element\n";
}
close FH;
}
####################################################
# Subroutine printArray
####################################################
# Parameter
# Reference to an array
# Return
# Prints the sorted array on the screen
####################################################
sub printArray{
my ($refArray) = @_;
foreach my $element (sort @$refArray){
print "$element\n";
}
}
sub printArrayUnsorted{
my ($refArray) = @_;
print "Output using printArrayUnsorted subroutine\n";
foreach my $element (@$refArray){
print "$element\n";
}
}
####################################################
# Subroutine readFileToArray
####################################################
# Parameter
# File name to read
# Return
# Reference to An array of lines
####################################################
sub readFileToArray{
my ($file) = @_;
my @array = ();
open(FH, "$file")||die "can't open file $file";
while(<FH>){
my $string = $_;
chomp $string; #remove next line symbol
$string =~ s/^\s+//; #remove leading spaces
$string =~ s/\s+$//; #remove trailing spaces
#print "$string\n";
$string =~ s/\"//g; #remove " from the string if there is one
#print "$string\n";
push(@array, $string);
}
close FH;
return \@array; #Return the array reference
}
####################################################
# Subroutine readFileToHash
####################################################
# Parameter
# File name to read
# Return
# Reference to a hash
####################################################
sub readFileToHash{
my ($file) = @_;
my %hash = ();
open(FH, "$file")||die "can't open file $file";
while(<FH>){
my $string = $_;
chomp $string; #remove next line symbol
$string =~ s/^\s+//; #remove leading spaces
$string =~ s/\s+$//; #remove trailing spaces
#print "$string\n";
$string =~ s/\"//g; #remove " from the string if there is one
#print "$string\n";
my ($key, @temp) = split("\t", $string);
my $value = join("\t", @temp);
$hash{$key} = $value;
}
close FH;
return \%hash; #Return the hash reference
}