A CD changer allows you to load more than one CD. Many of these
have random buttons, which allow you to play random tracks from a
specified CD, or play random tracks from random CDs. You are to
simulate a play list from such a CD changer using the randi function.
The CD changer that we are going to simulate can load 3 different CDs.
You are to assume that three CDs have been loaded. To begin with, the
program should “decide” how many tracks there are on each of the
three CDs, by generating random integers in the range from MIN to
MAX. You decide on the values of MIN and MAX (look at some CDs;
how many tracks do they have? What’s a reasonable range?). The
program will print the number of tracks on each CD. Next, the program
will ask the user for his or her favorite track; the user must specify
which track and which CD it’s on. Next, the program will generate a
“playlist” of the N random tracks that it will play, where N is an integer.
For each of the N songs, the program will first randomly pick one of the
3 CDs, and then randomly pick one of the tracks from that CD. Finally,
the program will print whether the user’s favorite track was played or
not. The output from the program will look something like this
depending on the random integers generated and the user’s input:
There are 15 tracks on CD 1.
There are 22 tracks on CD 2.
There are 13 tracks on CD 3.
What’s your favorite track?
Please enter the number of the CD: 4
Sorry, that’s not a valid CD.
Please enter the number of the CD: 1
Please enter the track number: 17
Sorry, that’s not a valid track on CD 1.
Please enter the track number: -5
Sorry, that’s not a valid track on CD 1.
Please enter the track number: 11
Play List:
CD 2 Track 20
CD 3 Track 11
CD 3 Track 8
CD 2 Track 1
CD 1 Track 7
CD 3 Track 8
CD 1 Track 3
CD 1 Track 15
CD 3 Track 12
CD 1 Track 6
Sorry, your favorite track was not played.
Matlab
Ch5Ex42.m
MIN = 7;
MAX = 14;
noCDs = 3;
N = 5;
cdtracks = randi([MIN, MAX], 1,3);
for i = 1:noCDs
fprintf('There are %d tracks on CD %d\n', cdtracks(i), i)
end
fprintf('\nWhat''s your favorite track?\n')
favcd = input('Please enter the number of the CD: ');
while favcd < 1 || favcd > noCDs
fprintf('Sorry, that''s not a valid CD.\n')
favcd = input('Please enter the number of the CD: ');
end
favtrack = input('Please enter the track number: ');
while favtrack < 1 || favtrack > cdtracks(favcd)
fprintf('Sorry, that''s not a valid track on CD %d\n', ...
favcd)
favtrack = input('Please enter the track number: ');
end
played = false;
disp('Play List: ')
for i = 1:N
rancd = randi([1, noCDs]);
rantrack = randi([1, cdtracks(rancd)]);
fprintf('CD %d Track %d\n', rancd, rantrack)
played = rancd == favcd && rantrack == favtrack;
end
if played
disp('Your favorite track was played!!')
else
disp('Your favorite track was not played.')
end
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