//Chap 5: p159
//The Invoice 3.0 program
#include<iostream>
#include<iomanip>

using namespace std;

int main()
{
	char customer_type;
	while (true)
	{
		cout << "Enter customer type (r/w):";
		cin >> customer_type;
		cin.ignore(numeric_limits<streamsize>::max(), '\n');
		if (tolower(customer_type) == 'r' || tolower(customer_type) == 'w')
			break;
		else
			cout << "Invalid customer entry! Try again.\n";
	}

	double subtotal;
	while (true)
	{
		cout << "Enter subtotal:";
		cin >> subtotal;

		if (cin.good())
			break;
		else if (cin.fail())
		{
			cout << "Invalid number! Try again.\n";
			cin.clear();
			cin.ignore(numeric_limits<streamsize>::max(), '\n');
		}
		else if (cin.bad())
		{
			cout << "BAD STREAM...EXITING PROGRAM....GOODBYE!!!\n";
			return 0;
		}
	}
	
	double discount_percent;
	if (tolower(customer_type) == 'r')
	{
		if (subtotal < 100)
			discount_percent = .0;
		else if (subtotal >= 100 && subtotal < 250)
			discount_percent = .1;
		else
			discount_percent = .2;
	}
	else if (tolower(customer_type) == 'w')
	{
		if (subtotal < 500)
			discount_percent = .4;
		else
			discount_percent = .5;
	}
	else
		discount_percent = .0;

	double discount_amount = subtotal * discount_percent;
	double invoice_total = subtotal - discount_amount;

	int col1 = 18;
	int col2 = 8;

	cout << fixed << setprecision(2) << endl		//2 decimal places
		<< "INVOICE" << endl
		<< left << setw(col1) << "Subtotal:"
		<< right << setw(col2) << subtotal << endl
		<< left << setw(col1) << "Discount Percent:"
		<< right << setw(col2) << discount_percent << endl
		<< left << setw(col1) << "Discount Amount:"
		<< right << setw(col2) << discount_amount << endl
		<< left << setw(col1) << "Invoice total:"
		<< right << setw(col2) << invoice_total << endl;
}

//Chap 5: p179
//The Temperature Analyzer Program

#include<iostream>
#include<fstream>
#include<string>
#include<iomanip>
#include<sstream>
using namespace std;

int main()
{
	cout << "Temperature Analyzer\n\n";

	string filename;
	ifstream infile;

	while (true)
	{
		cout << "Enter input filename : ";
		cin >> filename;
		cin.ignore(numeric_limits<streamsize>::max(), '\n');

		infile.open(filename);
		if (infile)
		{
			break;
		}
		cout << "Unable to open input file \"" << filename << "\", try again!\n";
	}
	cout << "Input file \"" << filename << "\" opened successfully.\n\n";

	cout << fixed << setprecision(1);

	int col = 7;	//col width
	cout	<< setw(col) << "Low" << setw(col) << "High"
			<< setw(col) << "Avg" << endl;
	cout << "----------------------------------------------" << endl;

	double low = 0.0;
	double high = 0.0;
	double avg = 0.0;
	double avg_total = 0.0;
	double lowest = 1000.0;
	double highest = - 1000.0;
	int lines_read = 0;
	int lines_processed = 0;

	string line;
	stringstream ss;
	while (getline(infile, line))
	{
		++lines_read;
		ss.str(line);
		ss.clear();

		if (ss >> low >> high)
		{
			++lines_processed;

			avg = (low + high) / 2;

			cout	<< setw(col) << low << setw(col) << high 
					<< setw(col) << avg << endl;

			avg_total += avg;
			if (low < lowest)
				lowest = low;
			if (high > highest)
				highest = high;
		}
	}
	infile.close();

	cout	<< endl
			<< lines_processed << " of "
			<< lines_read << " lines successfully processed.\n\n";

	double avg_daily = avg_total / lines_processed;
	
	int coll = 17;
	int col2 = 7;
	cout	<< left << setw(coll) << "Lowest temp: "
			<< right << setw(col2) << lowest << endl
			<< left  << setw(coll) << "Highest temp: "
			<< right << setw(col2) << highest << endl 
			<< left << setw(coll) << "Avg daily temp: "
			<< right << setw(col2) << avg_daily << endl << endl;
}
/*
OUTPUT:
Temperature Analyzer

Enter input filename : badName
Unable to open input file "badName", try again!
Enter input filename : temps.txt
Input file "temps.txt" opened successfully.

	Low   High    Avg
----------------------------------------------
   48.4   57.2   52.8
   46.0   50.0   48.0
   45.0   55.3   50.1
   54.0   61.0   57.5
   37.0   52.0   44.5
   37.0   43.3   40.1
   45.0   57.0   51.0
   48.0   55.0   51.5
   54.0   57.0   55.5
   48.1   54.3   51.2

10 of 14 lines successfully processed.

Lowest temp:        37.0
Highest temp:       61.0
Avg daily temp:     50.2
*/


/*
temps.txt
48.372	57.23
46	50
45.01	55.273839404
54	61
37	52
37	43.27
45	57
n/a	64
55.34	n/a
50a	59
48.0	55.0
54	57
48.1	54.27
*/

#include <iostream>
int main()
{
  std::cout << "Hello world!\n";
}

#include "iostream"

template <typename T, typename U>
auto max( T x, U y )
{
   return (x > y) ? x : y;
}

int main( )
{
   std::cout << max( 6.5, 5 ) << '\n';
}