#include <iostream>

void showMenu(int low, int high);
int getChoice();
void countForwards(int low, int high, int step);
void countBackwards(int low, int high, int step);
void getLowHigh(int& low, int& high);
void getStep(int& step);
void sort(int& low, int& high);

int main()
{
	int low, high, step;
	int choice;
	
	cout << "Welcome to the counting program." << endl;
	
	getLowHigh(low, high);
	getStep(step);
	
	do
	{		
		showMenu(low, high);
		choice = getChoice();
		switch (choice)
		{
			case 1 : countForwards(low, high, step);
					break;
			case 2 : countBackwards(low, high, step);
					break;
			case 3 : getLowHigh(low, high);
					break;
			case 4 : getStep(step);
					break;
		}
		
	} while (choice != 5);
	
	cout << "Goodbye!" << endl;
}

void showMenu(int low, int high)
{
	cout << "Would you like to:" << endl;
	cout << "1. count forwards from " << low << " up to " << high << endl;
	cout << "2. count backwards from " << high << " down to " << low << endl;
	cout << "3. enter a new high and low number" << endl;
	cout << "4. enter a new \"count by\" number" << endl;
	cout << "5. quit" << endl;
}

int getChoice()
{
	int choice;
	
	do
	{
		cout << "> ";
		cin >> choice;
	} while ((choice < 1) || (choice > 5));
	
	return choice;
}
void countForwards(int low, int high, int step)
{
	int count;
	
	cout << "Counting forwards from " << low << " up to " << high << endl;
	
	for (count = low; count <= high; count = count + step)
		cout << count << " ";
		
	cout << endl << endl;
}

void countBackwards(int low, int high, int step)
{
	int count;
	
	cout << "Counting backwards from " << high << " down to " << low << endl;
	
	for (count = high; count >= low; count = count - step)
		cout << count << " ";
		
	cout << endl << endl;
}

void getLowHigh(int& low, int& high)
{
	cout << "Please enter a high and low number : ";
	cin >> low >> high;
	sort(low, high);
}

void sort(int& low, int& high)
{
	int temp;
	
	if (low > high)
	{
		temp = low;
		low = high;
		high = temp;
	}	
}

void getStep(int& step)
{
	do
	{
		cout << "What would you like to count by ? ";
		cin >> step;
	}
	while (step < 1);
}

/* SAMPLE RUN
Welcome to the counting program.
Please enter a high and low number : 32 23
What would you like to count by ? 2
Would you like to:
1. count forwards from 23 up to 32
2. count backwards from 32 down to 23
3. enter a new high and low number
4. enter a new "count by" number
5. quit
> 1
Counting forwards from 23 up to 32
23 25 27 29 31 

Would you like to:
1. count forwards from 23 up to 32
2. count backwards from 32 down to 23
3. enter a new high and low number
4. enter a new "count by" number
5. quit
> 2
Counting backwards from 32 down to 23
32 30 28 26 24 

Would you like to:
1. count forwards from 23 up to 32
2. count backwards from 32 down to 23
3. enter a new high and low number
4. enter a new "count by" number
5. quit
> 3
Please enter a high and low number : 99 66
Would you like to:
1. count forwards from 66 up to 99
2. count backwards from 99 down to 66
3. enter a new high and low number
4. enter a new "count by" number
5. quit
> 4
What would you like to count by ? 33
Would you like to:
1. count forwards from 66 up to 99
2. count backwards from 99 down to 66
3. enter a new high and low number
4. enter a new "count by" number
5. quit
> 1
Counting forwards from 66 up to 99
66 99 

Would you like to:
1. count forwards from 66 up to 99
2. count backwards from 99 down to 66
3. enter a new high and low number
4. enter a new "count by" number
5. quit
> 5
Goodbye!
*/