Problem 1:

/*
Name 
CS201 HW3 
Problem 1
*/

#include <iostream>
using namespace std;

int main()
{
   for(int i = 1; i < 8; i++){

      for(int j = 1; j < 8; j++){
	 if( j == i || j == (8 - i))
	    cout << "x";
	 else
	    cout << " ";
      }
      cout << endl;

   }
   return 0;
}

/*

x     x
 x   x
  x x
   x
  x x
 x   x
x     x
Press any key to continue

*/

Problem 2:

/* 
Name 
CS201 HW3
Problem 2
*/

#include <iostream>
using namespace std;

int main()
{
   int n, inputNumber, firstLargest, secondLargest;
			
   do{  // handle unreasonable input
      cout <<  "How many integers will you be entering? ";
      cin >> n;

      if (n > 50)
         cout << endl << "Please enter a number less then 50." << endl;

       else if (n < 2)
         cout << "You need at least 2 integers." << endl;

   } while ((n > 50) || (n < 1));

   for (int i=1; i<=n; i++){
      cout <<"Number  " << i << " : ";
      cin >> inputNumber;
      cout << endl;

      if (inputNumber >= firstLargest){
         secondLargest = firstLargest;
         firstLargest = inputNumber;
      }
      else if (inputNumber >= secondLargest)
      secondLargest = inputNumber;

   }
	
   cout << "The two largest numbers: " << firstLargest 
        << " and " << secondLargest << "." << endl;

   return 0;
}

/*

How many integers will you be entering? 4
Number  1 : 45

Number  2 : -4

Number  3 : 23

Number  4 : 32

The two largest numbers: 45 and 32.
Press any key to continue

*/
Problem 3:

/*
Name
CS201 HW3
Problem 3
*/

#include <iostream>
using namespace std;

int main()
{
   int x, y;
   do{
       cout << "Enter the number of columms: ";
       cin >> x;

       if (x > 50)
	  cout << endl << "Please enter a number less then 50." << endl;

       else if (x < 1)
          cout << "It needs to be at least 1." << endl;

    } while ((x > 50) || (x < 1));

    do{
       cout << "Enter the number of rows: ";
       cin >> y;

       if (y > 50)
	  cout << endl << "Please enter a number less then 50, I'm tired" << endl;

       else if (y < 1)
	  cout << "It needs to be at least 1." << endl;

    } while ((y > 50) || (y < 1));


    for (int i=0; i < y; i++){
       for (int z=0; z < x; z++){
	  cout << "*";
       }
       cout << endl;
    }

    return 0;
}

/*
Enter the number of columms: -4
It needs to be at least 1.
Enter the number of columms: 8
Enter the number of rows: 10
********
********
********
********
********
********
********
********
********
********
Press any key to continue

*/


Problem 4:

/*
Name
CS201 HW3
Problem 4
*/

#include <iostream>
using namespace std;

int main() 
{
   int x;

   do{
      cout << "Enter a positive integer: ";
      cin >> x;

      if (x < 0)
  	 cout << "I said a positive integer." << endl;
    } while (x < 0);

    cout << endl << x << ", ";

    while (x != 1){
       if (x != 1 && (x % 2) == 0){
	  x = x / 2;
	  cout << x << ", ";
       }

       if (x != 1 && (x % 2) == 1){
          x = (3*x) + 1;
  	  cout << x << ", ";
       }
    }

    cout << endl;

    return 0;
}


/*

Enter a positive integer: 23

23, 70, 35, 106, 53, 160, 80, 40, 20, 10, 5, 16, 8, 4, 2, 1,
Press any key to continue


Enter a positive integer: 48

48, 24, 12, 6, 3, 10, 5, 16, 8, 4, 2, 1,
Press any key to continue

*/


Problem 5:

/*
Name 
CS201 HW3
Problem 5
*/

#include <iostream>
using namespace std;

int main()
{ 
   int x;
	
   do{
     do{
	 cout << "Enter a positive integer from one to nine, zero to quit: ";
         cin >> x;

	 if (x < 0 || x > 9)
 	 cout << "\a Try again" << endl;
     } while (x < 0 || x > 9);

     switch (x){
	case 1:
	        cout << "one" << endl;
		break;

	case 2:
		cout << "two" << endl;
		break;

	case 3:
		cout << "three" << endl;
		break;

	case 4:
		cout << "four" << endl;
		break;

	case 5:
		cout << "five" << endl;
		break;
	
	case 6:
		cout << "six" << endl;
		break;

	case 7:
		cout << "seven" << endl;
		break;

	case 8:
		cout << "eight" << endl;
		break;

	case 9:
		cout << "nine" << endl;
		break;
		
	default:
		cout << "Drunk, fix later" << endl;
	}

    } while (x != 0); // sentinel input 0 to terminate

    return 0;
}

/*
Enter a positive integer from one to nine, zero to quit: -9
 Try again
Enter a positive integer from one to nine, zero to quit: 1
one
Enter a positive integer from one to nine, zero to quit: 3
three
Enter a positive integer from one to nine, zero to quit: 2
two
Enter a positive integer from one to nine, zero to quit: 5
five
Enter a positive integer from one to nine, zero to quit: 6
six
Enter a positive integer from one to nine, zero to quit: 4
four
Enter a positive integer from one to nine, zero to quit: 9
nine
Enter a positive integer from one to nine, zero to quit: 7
seven
Enter a positive integer from one to nine, zero to quit: 8
eight
Enter a positive integer from one to nine, zero to quit: 0
Press any key to continue
*/