This example alludes to in the "Think before programming" section of the Teams lab page about computer usage. We'll say that the file contains the usage for computers on campus for a week's period. Say that you have a file that contains something like the teams lab does with the first column being the computer ID, the second column being the number of users who have used that computer, and the third column being the total number of hours. For example:

NOSHHZONE001	25	145
NOSHHZONE002	29	152
NOSHHZONE003	27	165
NOSHHZONE004	18	35

You need to read in the file, create a class to store the data (presumably a Computer class), create a vector<Computer *> to store the instances of computer and then use the objects stored in the vector to answer questions like:

  1. Which computer had the most users during the week?
  2. Which computer had the highest average number of hours per user (i.e. total hours / total users)?
  3. What is the average number of hours per user across all computers in the file?
// Test Case 1
//  INPUT: testcase.txt
// NOSHHZONE001	25	145
// NOSHHZONE002	29	152
// NOSHHZONE003	1	1000  <-- Test case category: One user
// NOSHHZONE004	0	0     <-- Test case category: No users, no hours
// NOSHHZONE005	1	0     <-- Test case category: One user, no hours
//
// EXPECTED OUTPUT:
//	Which computer had the most users during the week? NOSHHZONE002
//	Which computer had the highest average number of hours per user (i.e. total hours / total users)? NOSHHZONE003
//	What is the average number of hours per user across all computers in the file? 23.16 hours
 
#include <iostream>
#include <fstream>
#include <vector>
 
using namespace std;
 
// HERE IS MY CLASS DEFINITION
class Computer{
public:
	Computer();
	Computer(string new_id, int new_num_hours, int new_num_users);
	string get_id() const;
	int get_num_hours() const;
	int get_num_users() const;
 
private:
	string id;
	int num_hours;
	int num_users;
};
 
// HERE I DEFINE MY CLASS CONSTRUCTORS
Computer::Computer(string new_id, int new_num_users, int new_num_hours){
	id = new_id;
	num_users = new_num_users;
	num_hours = new_num_hours;
}
 
// HERE I DEFINE MY CLASS FUNCTIONS
string Computer::get_id() const{
	return id;
}
 
int Computer::get_num_hours() const{
	return num_hours;
}
int Computer::get_num_users() const{
	return num_users;
}
 
// HERE IS MY MAIN FUNCTION
int main(){
	// GET THE DATA
	// Ask user for filename
	cout << "Please, dear user, give me a filename:";
 
	// Get the input
	string filename;
	cin >> filename;
	cout << endl << "Opening " << filename << endl;
 
	// Open the file
	ifstream in_file;
	in_file.open(filename.c_str());
 
	// Read in the file
	string computer_id;
	int num_users;
	int num_hours;
	vector<Computer *> computers;
	while(in_file >> computer_id >> num_users >> num_hours){
		// Parse the data in the file
		//cout << "You made to this point in the code"<<endl;
		cout << computer_id << " had " << num_users << " users (" << num_hours << ")" << endl;
		// Use a class to store the data
		Computer * new_computer = new Computer(computer_id, num_users, num_hours);
		cout << new_computer->get_id() << " had " << new_computer->get_num_users() << " users (" << new_computer->get_num_hours() << ")" << endl;
		computers.push_back(new_computer);
	}
 
	// ANALYZE THE DATA
        // Answer question 1, computer with most hours
	string computer_id_with_most_hours = "No Computer";
	int max_hours = 0;
	// Look through the hours
	for(int i = 0; i < computers.size(); i++){
		// Compare and find the computer with the most hours
		if(computers[i]->get_num_hours() > max_hours){
			max_hours = computers[i]->get_num_hours();
			computer_id_with_most_hours = computers[i]->get_id();
		}
	}
	// print out computer with most hours (answer question 1)
	cout << "The computer with the most hours is " << computer_id_with_most_hours << "(" << max_hours << ")" << endl;
 
        // Answer question 2
        // Answer question 3
}
cs-142/computers.txt · Last modified: 2015/01/07 16:13 by ryancha
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