C shell--take the minimum of a column

Shell Programming and Scripting
1

I have a data file with two columns,
for the second column I want to find the minimum,
and subtract this minimum from each value in the second column,
how to realize this using C shell

For example, I have

1  -2.4
2  -4.8
3   7.9

I wanna output

1    2.4
2    0
3  12.7

Thanks!

2 
my $min=0;
while(<DATA>){
  chomp;
  my @tmp = split;
  $hash{$.}->{val}=[@tmp];
  $min=($tmp[1]<=$min)?$tmp[1]:$min;
}
foreach my $key (sort {$a<=>$b} keys %hash){
  print $hash{$key}->{val}->[0]," ",$hash{$key}->{val}->[1]-$min,"\n";
}
__DATA__
1  -2.4
2  -4.8
3   7.9
3

Thanks a lot, summer cherry!
Anyone can help on a C shell version?
Appreciate your time!

4

data

1  -2.4
2  -4.8
3   7.9

set asd = `awk '$2< min {min=$2;} END{ print min}' data`
awk '{$2=$2 - '"$asd"'} {print $0}' data
5

It works.
Thanks a lot!