Another way would be to use the conditional operator inside a loop # field number for sizes SM MD LG XL
my @fno =(9,12,15,18);
while (<DATA>) { ## file2
my @data = split(',',$_);
my $ky = $data[0];
if (exists $stock{$ky}) {
# check each size
for my $sz (0..3){
$data[$fno[$sz]] = ( $stock{$ky}[$sz] eq '0' ) ? '' : '0' ;
}
}
print (join(',', @data));
}
poj
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