/*
   lab08.txt
   CIS 150
   6/21/05
   David Klick
   
   Solution to lab #8.
*/

#include <iostream>
using std::cout;
using std::cin;

int main(void) {
   int num, i, sum, x;
   
   // step 1
   // ask the user for a number
   //    display "Hello, world!" that many times
   cout << "How many times should I display my message? ";
   cin >> num;
   for (i=1; i<=num; i++) {
      cout << "Hello, world!\n";
   }
   cout << '\n';
   
   // step 2
   // ask the user how many numbers they want
   //    to enter to have summed
   do {
      cout << "How many numbers would you like to enter: ";
      cin >> num;
      if (num < 0) {
         cout << "Error: Number must be positive\n";
      }
   } while (num < 0);
   
   // now get the numbers, add them up, and display sum
   sum = 0;
   for (i=1; i<=num; i++) {
      cout << "Enter number: ";
      cin >> x;
      sum += x;
   }
   cout << "The sum is " << sum << "\n\n";
   
   // step 3
   // display whether numbers are even or odd
   //   until user enters -999
   cout << "Enter an integer (-999 to quit): ";
   cin >> num;
   while (num != -999) {
      if (num % 2 == 0) {
         cout << num << " is even\n";
      } else {
         cout << num << " is odd\n";
      }
      cout << "Enter an integer (-999 to quit): ";
      cin >> num;
   }
   cout << '\n';

   // step 4
   // display the odd numbers from 1 to 10 using all three loops
   for (i=1; i<=10; i+=2) {
      cout << i << " ";
   }
   cout << '\n';
   
   i = 1;
   while (i <= 10) {
      cout << i << " ";
      i+=2;
   }
   cout << '\n';

   i = 1;
   do {
      cout << i << " ";
      i+=2;
   } while (i <= 10);
   cout << '\n';

   return 0;
}