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#!/usr/bin/perl

# Template for Applied Programming course exercise Day2 Exercise 1

use strict;
use warnings;

my @sampleA = (65,69,70,63,70,68);
my @sampleB = (102,95,98,110);
my @sampleC = (112,115,113,109,95,98,100);

run_analysis("sampleA",@sampleA);
run_analysis("sampleB",@sampleB);
run_analysis("sampleC",@sampleC);

=head1 run_analysis()
 Purpose: execute calculations and print report
 In: string, array of numerical values
 Out: print to screen
=cut
sub run_analysis {
    my ($name,@values) = @_;
    my $sample_count = scalar(@values);
    my $avg = calc_avg(@values);
    my $variance = calc_variance($avg,@values);
    my $sd = calc_sd($variance);
    write_report($name,$sample_count,$avg,$variance,$sd);
}

=head1 write_report()
 Purpose: print formatted results to screen
 In: a list of strings
 Out: print to screen
=cut
sub write_report {
    my($tissue,$sample_count,$avg,$variance,$sd) = @_;
    print "\n";
    print "$tissue\n-----\n";
    printf "n:%3u\n",$sample_count;
    printf "average: %5.1f\n", $avg;
    #... insert printf stateents for variance and sd
 }


=head1 calc_avg()
 Purpose: calculate the mean of a set of numbers
 In: an array of numbers
 Out: scalar
=cut
sub calc_avg {
    my (@values) = @_;
    my $nr_values = scalar(@values);
    # ... calculate mean
    return $avg;
}
    
sub calc_variance {
    #code to calculate variance
}

sub calc_sd {
   #code to calculate sd
   #       
}