#include <iostream>
#include <string>
using namespace std;

int main()
{

	//Challenge #0: Count up to 10: 1 2 3 4 5 6 7 8 9 10
	int i=1;

	while ( i <= 10 )
	{
		cout << "current number: ";
		cout << i << endl;

		i = i + 1;
	}

	//for loop
	for (int i = 1; i <= 10; i = i + 1)  //i=i+1  same as i++
	{
		cout << "current number (with a forloop): ";
		cout << i << endl;
	}


	cout << endl;
	cout << endl;
	//Challenge #1: Count by 2's up to 20: 2 4 6 8 10 12 14 16 18 20
	i = 2;
	
	while (i <= 20)
	{
		cout << i << endl;
		i = i + 2;
	}


	cout << endl;
	cout << endl;
	// Challenge #2: Ask for two numbers, first one smaller than 2nd :
	//example: 12, 17.  Print: 12 13 14 15 16 17
	int num1;
	int num2;

	cout << "Enter num1: ";
	cin >> num1;
	cout << "Enter num2: ";
	cin >> num2;

	i = num1;
	while (i <= num2)
	{
		cout << i << " ";
		i++;
	}
	
	cout << endl;

	for (int i = num1; i <= num2; i++)
	{
		cout << i << " ";
	}

	cout << endl;
	cout << endl;
	//Challenge #3: compute 1+2+3+...+100
	int sum = 0;

	for (int i = 1; i <= 100; i++)
	{
		sum = sum + i;
	}

	cout << "The sum of integers from 1 to 100 is: " << sum << endl;

	cout << endl;
	cout << endl;
	//Challenge #4: Say the alphabet: a b c d e f ....
	char c;
	c = 'a';  //c has value 97

	while (c <= 'z')
	{
		cout << c << endl;
		c = c + 1;
	}
	cout << "Next time won't you sing with me!" << endl;


	//Challenge #5:  Alphabet again, but capitalize all the vowels
	c = 'a';  //c has value 97

	while (c <= 'z')
	{
		if (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u')
		{
			char capitalVersion;
			capitalVersion = c - 32;
			cout << capitalVersion << " (A Vowel!!!!)" << endl;
		}
		else
		{
			cout << c << endl;
		}

		c = c + 1;
	}
	cout << "Next time won't you sing with me!" << endl;


	cout << endl;
	cout << endl;
	//Challenge #6: Ask for user's name in lower-case.  Print it back, but 1) vertically and 2) upper-case
	string name;
	cout << "Enter your name in lower case: ";
	cin >> name;

	for (int i = 0; i < name.length(); i++)
	{
		char capital = name[i] - 32;
		cout << capital << endl;
	}


	cout << endl;
	cout << endl;
	//Challenge #7: Ask user how many carry-on items they will bring on the plane.
	//Then, ask the weight of each item.  Finally, tell user what the total weight is.

	
	cout << endl;
	cout << endl;
	//Challenge #8: Ask user to enter a number of rows and and line length, and print a box of those dimensions.
	//Example:  If the user enters 3 for rows, and 5 for columns, the program displays a 3x5 box:
	// *****
	// *****
	// *****
	int numRows;
	int numColumns;
	cout << "Enter number of rows: ";
	cin >> numRows;
	cout << "Enter number of columns: ";
	cin >> numColumns;

	for (int i = 0; i < numRows; i++)
	{
		//print 1 row of length numColumns
		for (int i = 0; i < numColumns; i++)
		{
			cout << "*";
		}
		cout << endl;
	}


	//Challenge #9:  Ask user to enter a number.  Tell them how many distinct factors number has.

	
	return 0;
}