Exercise 7.1: Difference between revisions

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New page: Example 7-1 (stored b/c could not be saved) <pre> #!/usr/bin/perl -w use strict; #Erika Phelps #Sept 30, 2009 #Ex 7-1: Children's game with random numbers #Declare the variables my $cou...
 
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<pre>
<pre>
#!/usr/bin/perl -w
#!/usr/bin/perl
use warnings;
use strict;
use strict;


#Erika Phelps
#Erika Phelps
#Sept 30, 2009
#Oct 4, 2009
#Ex 7-1: Children's game with random numbers
#Exercise 7.1


#Declare the variables
#Pseudocode:
my $count;
#Ask user to input an amino acid.
my $input;
#Guess a random nucleotide until the user confirms the guess.
my $number;
#From an array with the 4 nucleotides, randomly choose one to output
my $sentence;
my $story;


#Here are the arrays of parts of sentences
#Declare variables


my @nouns = (
my $amino_acid;
 
my $guess;
    'Dad', 'TV', 'Mom', 'Groucho', 'Rebecca', 'Harpo', 'Robin Hood',
my @nucleotide = ('A', 'T', 'G', 'C');
    'Joe and Moe',
my $nucleotide;
    );
my $input;


my @verbs = (
#Ask user to choose a nucleotide:


    'ran to', 'giggled with', 'put hot sauce into the orange juice of',
print "This program will try to guess which nucleotide you have chosen.\n";
    'exploded', 'dissolved', 'sang stupid songs with', 'jumped with',
print "Please input the one-letter code for an amino acid:\n";
    );


my @prepositions = (
$amino_acid = <STDIN>;


    'at the store', 'over the rainbow', 'just for the fun of it',
chomp $amino_acid;
    'at the beach', 'in New York City', 'in a dream', 'around the world',
    );


#Seed the random number generator
#Seed the random number generator


srand(time|$$);
srand(time|$$);
#This do-until loop composes six sentence "stories" until the user types quit.


do {
do {


     #(Re)set $story to the empty string each time through the loop
     $guess = $nucleotide[int(rand(scalar @nucleotide))];
 
    $story = '';
 
    #Make six sentences per story
 
    for ($count = 0, $count <6; $count++) {
 
        #Notes on the following statements:
        #1) scalar @array gives the number of elements in the array.
        #2) rand returns a random number greater than 0 and less than
            #scalar value
        #3) int removes the fractional part of a number
        #4) . joins two strings together
 
        $sentence = $nouns[int(rand(scalar @nouns))]
            . ""
            . $verbs[int(rand(scalar @verbs))]
            . ""
            . $nouns[int(rand(scalar @nouns))]
            . ""
            . $prepositions[int(rand(scalar @prepositions))]
            . '.';
 
        $story .= $sentence;
    }


    #Print the story
     print "Is \"$guess\" your nucleotide? Type \"Y\" if yes and \"N\" if no.\n";
 
     print "\n",$story,"\n";
 
    #Get user input.
 
    print "\nType \"quit\" to quit, or press Enter to continue: ";


     $input = <STDIN>;
     $input = <STDIN>;


    #Exit the loop at user's request
} until($input =~ /^s*y/i);
 
} until($input =~ /^\s*q/i);


exit;
exit;
   
</pre>
</pre>

Revision as of 03:30, 5 October 2009

Example 7-1 (stored b/c could not be saved) 

#!/usr/bin/perl
use warnings;
use strict;

#Erika Phelps
#Oct 4, 2009
#Exercise 7.1

#Pseudocode:
#Ask user to input an amino acid.
#Guess a random nucleotide until the user confirms the guess.
#From an array with the 4 nucleotides, randomly choose one to output

#Declare variables

my $amino_acid;
my $guess;
my @nucleotide = ('A', 'T', 'G', 'C');
my $nucleotide;
my $input;

#Ask user to choose a nucleotide:

print "This program will try to guess which nucleotide you have chosen.\n";
print "Please input the one-letter code for an amino acid:\n";

$amino_acid = <STDIN>;

chomp $amino_acid;

#Seed the random number generator

srand(time|$$);

do {

    $guess = $nucleotide[int(rand(scalar @nucleotide))];

    print "Is \"$guess\" your nucleotide? Type \"Y\" if yes and \"N\" if no.\n";

    $input = <STDIN>;

} until($input =~ /^s*y/i);

exit;
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