Activecode Exercises

Answer the following Activecode questions to assess what you have learned in this chapter.

Let’s write the struct definition for Song. Song should have instance variables title, artist, and numLikes.

#include <iostream> using namespace std; // YOUR CODE HERE

Below is one way to define the Song struct.

#include <iostream> using namespace std; struct Song { string title; string artist; int numLikes; };

Let’s make an album! Write the struct definition for Album, which should have instance variables name, year and a vector of Songs.

#include <iostream> #include <vector> using namespace std; // YOUR CODE HERE

Below is one way to define the Album struct.

#include <iostream> #include <vector> using namespace std; struct Song { string title; string artist; int numLikes; }; struct Album { string name; int year; vector<Song> songs; };

Two Songs are equal if the title and artist of the Songs are equal. Write the function songEqual, which takes two Songs as parameters and returns true if they are equal.

#include <iostream> using namespace std // YOUR CODE HERE

Below is one way to write the songEqual function.

#include <iostream> using namespace std struct Song { string title; string artist; int numLikes; }; bool songEqual (const Song& a, const &Song b) { if (a.title == b.title && a.artist == b.artist) { return true; } else { return false; } }

What if we’d like to search an album for our favorite song? Write the Album member function searchAlbum which takes a Song as a parameter and returns the location of the Song in the album. If the song isn’t found, return -1. Use the songEqual function we defined earlier!

#include <iostream> #include <vector> using namespace std; // YOUR CODE HERE

Below is one way to write the Album member function.

#include <iostream> #include <vector> using namespace std; struct Song { string title; string artist; int numLikes; }; struct Album { string name; int year; vector<Song> songs; }; int Album::searchAlbum (const Song& a) { for (size_t i = 0; i < songs.size(); ++i) { if (songEqual (songs[i], a)) { return i; } } return -1; }

What’s the most popular Song within an Album? Let’s write the Album member function mostLikedSong, which prints out the information of the most liked Song in the format “The most liked song is title by artist with numLikes likes.”

#include <iostream> #include <vector> using namespace std; // YOUR CODE HERE

Below is one way to write the Album member function.

#include <iostream> #include <vector> using namespace std; struct Song { string title; string artist; int numLikes; }; struct Album { string name; int year; vector<Song> songs; }; void Album::mostLikedSong () { int maxIndex = 0; int maxLikes = 0; for (size_t i = 0; i < songs.size(); ++i) { if (songs[i].numLikes > maxLikes) { maxIndex = i; maxLikes = songs[i].numLikes; } } cout << "The most liked song is " << songs[maxIndex].title; cout << " by " << songs[maxIndex].artist << " with "; cout << songs[maxIndex].numLikes << " likes." << endl; }

Let’s write the struct definition for Product. Product should have instance variables name and price.

#include <iostream> using namespace std; // YOUR CODE HERE

Below is one way to define the Product struct.

#include <iostream> using namespace std; struct Product { string name; double price; };

Let’s make a shopping list! Write the struct definition for List, which should have instance variables type and a vector of Products.

#include <iostream> #include <vector> using namespace std; // YOUR CODE HERE

Below is one way to define the List struct.

#include <iostream> #include <vector> using namespace std; struct Product { string name; double price; }; struct List { string type; vector<Product> products; };

Two Products are equal if the name and price of the Products are equal. Write the function productEqual, which takes two Products as parameters and returns true if they are equal. What if we want to check to see if we have bananas in our shopping list? Write the List member function searchList, which takes a Product as a parameter and returns the location of the Product in the List. Return -1 if it’s not in the List.

#include <iostream> #include <vector> using namespace std; // YOUR CODE HERE

Below is one way to write the searchList member function.

#include <iostream> #include <vector> using namespace std; struct Product { string name; double price; }; bool productEqual (const Product& a, const &Product b) { if (a.name == b.name && a.price == b.price) { return true; } else { return false; } } int List::searchList (const Product& a) { for (size_t i = 0; i < products.size(); ++i) { if (productEqual (products[i], a)) { return i; } } return -1; }

Time to checkout! Write the List member function totalPrice which calculates and returns the total price of all the Products.

#include <iostream> #include <vector> using namespace std; // YOUR CODE HERE

Below is one way to write the totalPrice member function.

#include <iostream> #include <vector> using namespace std; struct Product { string name; double price; }; struct List { string type; vector<Product> products; }; double List::totalPrice () { double total = 0; for (size_t i = 0; i < products.size(); ++i) { total += products[i].price; } return total; }

Oops! We made a mistake and grabbed pineapple pizza. What if we want to remove an Product from our List? Write the List member function removeProduct, which takes an index as a parameter and removes it. Then it fills the gap with the last product in the List.

#include <iostream> #include <vector> using namespace std; // YOUR CODE HERE

Below is one way to write the removeProduct member function.

#include <iostream> #include <vector> using namespace std; struct Product { string name; double price; }; struct List { string type; vector<Product> products; }; void List::removeProduct (int index) { products[index] = products[products.size() - 1]; }

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