Combining Loops with if Statements

Let's look at this program :

// file : guess.C
#include <iostream.h>
const int tries=6;
main(int argc, char *argv[])
{
  int num;
  int guess;
  int i;

  srand(atoi(argv[1]));
  num=rand() % 128 + 1;
  
  cout << "I'm thinking of a number between 1 and 128" << endl;
  cout << "You have " << tries << " guesses." << endl;
  for (i=0 ; i<tries ; i++)
    {
      cout << "(" << i+1 << ") Take a guess : ";
      cin >> guess;
      if (guess > num)
	        cout << "Nope, my number is smaller than that." << endl;
      else if (guess < num)
	        cout << "Nope, my number is larger than that." << endl;
      else
	        {
	          cout << "That's it!" << endl;
	          break;
	        }
    }
  if (i==tries)
    cout << "Sorry, you used up all your guesses..." << endl;
}

There are a couple of new things here :

• main(int argc, char *argv[])
• srand(atoi(argv[1]));
• num=rand() % 128 + 1;
• break;

Can you modify this program to use a while loop or a do-while loop instead of a for loop?

Why do you think I set tries = 6 and made the numbers range between 1 and 128?