Richard Lee wrote:
I just read FAQ on finding out yesterday's time.
I see that one of the easy way to find out is
my $date = scalar localtime( ( time() - ( 24 * 60 * 60 ) ) );
print "$date\n";
and it works fine for me
I also see lot of modules that will make life easier for beginners..
but since I was learning reference, I wanted to try this on my own
since Leap year is not a huge factor, so
my @Jan = (1..31);
my @Feb = (1..29);
my @Mar = (1..31);
my @Apr = (1..30);
my @May = (1..31);
my @Jun = (1..30);
my @Jul = (1..31);
my @Aug = (1..31);
my @Sep = (1..30);
my @Oct = (1..31);
my @Nov = (1..30);
my @Dec = (1..31);
my @cal_r = [
@Jan,@Feb,@Mar,@Apr,@May,@Jun,@Jul,@Aug,@Sep,@Oct,@Nov,@Dec ];
for my $i ( 0 .. $#cal_r ) {
for my $j ( 0 .. $#{ $cal_r[ $i ] } ) {
print "$cal_r[ $i ][ $j ]\n";
}
}
and then just check to see if it's first day of the month and if it
is, go through @cal_r and find the previous month and find the last
array item..
Algorithm seems to be correct but I cannot get to the item the way I
thought I could.
What would be the correct syntax if I knew the date? say Apr 1st to
find the yesterday's date given above?
I was thinking something along the line of
for my $i ( 0 .. $#cal_r ) {
if ($cal_r[$i][0]) {
print "yesterday is $cal_r[$i-1][lastday]\n"
}
}
I rewrote it like this(not considering all possiblities) for now.
#!/usr/bin/perl -w
use strict;
use Data::Dumper;
my %cal;
my @Month = qw(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec);
$cal{'Jan'} = [ 1..31 ];
$cal{'Feb'} = [ 1..29 ];
$cal{'Mar'} = [ 1..31 ];
$cal{'Apr'} = [ 1..30 ];
$cal{'May'} = [ 1..31 ];
$cal{'Jun'} = [ 1..30 ];
$cal{'Jul'} = [ 1..31 ];
$cal{'Aug'} = [ 1..31 ];
$cal{'Sep'} = [ 1..30 ];
$cal{'Oct'} = [ 1..31 ];
$cal{'Nov'} = [ 1..30 ];
$cal{'Dec'} = [ 1..31 ];
#print "$cal{'Dec'}->[0]\n";
print "Enter a date\n";
chomp(my $answer = <STDIN>);
my ($month, $day) = split(/ /,$answer);
if ($day == '1') {
if ($month eq 'Jan') {
print "yesterday was $Month[-1] $cal{ $Month[-1] }[-1]\n";
} else {
my $pos = '0';
for (@Month) {
if ( $month eq $_ ) {
last;
} else {
++$pos;
}
}
print "yesterday was $Month[$pos - 1 ] $cal{ $Month[ $pos - 1]
}[-1]\n";
}
} else {
my $c_day = $day - 1;
print "yesterday was $month $c_day \n";
}
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