Intermediate6-15.cpp

//I got a tiny bit further in the book and realized I was
//coding pretty inefficiently in the switch/case area.
//These are the updates I made to that.
//

#include <iostream>
#include <iomanip>
#include <typeinfo>
#include <limits>

using namespace std;

int main()
{
	char gender = ' ';
	char activity = ' ';
	int weight = 0;
	double caloriesPP = 0.0;
	
	
	do
	{
		cout << endl << "Enter Gender (m/f):" << endl;
		cin >> gender;
		gender = toupper(gender);
		
			if (gender != 'M' && gender != 'F')
			{
				cout << endl << "Invalid input. Please use only M/F." << endl;
			} //end if
			
	} while (gender != 'M' && gender != 'F');//end do/while
	
	do
	{
		cout << endl << "Enter Activity level (a/i):" << endl;
		cin >> activity;
		activity = toupper(activity);
		
			if (activity != 'A' && activity != 'I')
			{
				cout << endl << "Invalid input. Please use only A/I." << endl;
			} //end if
			
	} while (activity != 'A' && activity != 'I');//end do/while
				
	do
	{
	cin.clear();
	cin.ignore(numeric_limits<streamsize>::max(), '\n');
	//I had to look ^this^ up to get it to stop freaking out when I would put in a 
	//string/char instead of a number. Sounds like it basically empties whatever is 
	//in the >> for an unlimited number of characters until it reaches a linebreak.
	cout << endl << "Enter weight (lbs):" << endl;
	cin >> weight;	
	
		if (weight <= 0)
		{
			cout << endl << "Invalid input. Please enter an integer greater than 0." << endl;
			
		}
		
	} while (weight <= 0);
	
	//I wasn't sure if it was bad form or not to use default as a result rather than 
	//an error, but I figured I should learn both ways. Is more efficiency > easier
	//debugging? It depends on the team, I'm guessing.
	switch (gender) 
	{
		case 'M':
				switch (activity) 
				{
					case 'A':
						caloriesPP = weight * 15;
						break;
						
					default:
						caloriesPP = weight * 13;
						break;

				}//end M/AI switch
			break;
			
		default:
				switch (activity) 
				{
					case 'A':
						caloriesPP = weight * 12;
						break;
						
					default:
						caloriesPP = weight * 10;
						break;

				}//end F/AI switch
			break;
		
	}//end switch


	cout << endl << "Calories needed to maintain weight:" << endl << caloriesPP;
	
	return 0;
}