assign_6.cpp

#include <cstdlib>
#include <ctime>
#include <iostream>
#include <fstream>
#include <iomanip>
#include <cmath>

using namespace std;

//Function prototypes
char* genName(int n);
int getBinIndex(int n);


int main () {
	srand(time(NULL));

	ofstream file;
	string categories[] = {"Electronics", "Clothing", "Footwear", "Books", "Appliance", "Apps"};
	double minn[] = {35, 45, 99, 7, 150, 0.5};
	double maxx[] = {1500, 550, 339, 45, 600, 4.99};
	int bin[10]{0};

	//Data types
	int id;
	string name;
	string category;
	double price;
	bool two_day_shipping;
	int numclicked;

	//Random number index, bin index and maximum click index
	int randIdx, bin_idx, max_clicks = -1;
	
	//Store the file name and most popular data
	string fname, most_popular = "";
	
	for (int i = 0; i < 3; i++){
		
		cout << "Sample " << i << "\n";
		cout << left << setw(5) << "id" << setw(12) << "name" << setw(10) << "price" << setw(15) << "category" << setw(10) << "2D ship" << setw(15) << "numclicked" << "\n";
		
		//String stream to collect the 1000 randomly generated data
		stringstream data;
		for (id = 1; id <= 1000; id++) {
			//Stringstream to collect data line by line
			stringstream line;
			
			randIdx = rand()%6;
			name = new char[randIdx+5]; //Allocate memory for the name
			name = genName(randIdx+5);
			category = categories[randIdx];
			
			//Compute random value between minimum price and maximum price
			double tmp = (double)rand()/(maxx[randIdx]-minn[randIdx]); //quotient
			tmp = (tmp - floor(tmp))*(maxx[randIdx]-minn[randIdx]); //remainder
			price = tmp;

			two_day_shipping = rand()%2;
			numclicked = rand()%10001;
			
			//Copy line into stream with nice formatting
			line << left << setw(5) << id << setw(12) << name << fixed << setprecision(2) << setw(10) << price << setw(15) << category << setw(10) << two_day_shipping << setw(15) << numclicked << "\n";
			
			data << line.str();
			if (numclicked > max_clicks)
				most_popular = line.str();
			
			//Print the first 50 lines
			if (id <= 50)
				cout << line.str();
			line.clear();

			//Compute the bin index
			bin_idx = getBinIndex(numclicked);
			bin[bin_idx]++;
		}

		//Output Statistics
		cout << "\nStatistics\n\n";
		for (int i = 0; i < 9; i++) {
			cout << "Bin " << i << ":" << bin[i] << "\n";
		}

		//Print out the most popular item
		cout << "\nMost popular item\n";
		cout << most_popular;

		//Take the name of the file
		cout << "Please enter the name of the file: ";
		cin >> fname;

		//Write data to the file
		file << data.str();
		
		delete[] name; //free memory
		data.clear();
		file.close();
	}


}

//Generate a random name between 5 and 10
char* genName(int n) {
	char* name = new char[n+1];
	name[n] = 0;
	for (int i = 0; i < n; i++) {
		name[i] = 'a' + (rand() % 26);
	}
	return name;
}

//Compute the index for each bin
int getBinIndex(int n) {
	int idx;
	switch(n) {
		case 0 ... 1000: idx=0;break;
		case 1001 ... 2000: idx=1;break;
		case 2001 ... 3000: idx=2;break;
		case 3001 ... 4000: idx=3;break;
		case 4001 ... 5000: idx=4;break;
		case 5001 ... 6000: idx=5;break;
		case 6001 ... 7000: idx=6;break;
		case 7001 ... 8000: idx=7;break;
		case 8001 ... 9000: idx=8;break;
		case 9001 ... 10000: idx=9;break;
	}
	return idx;
}