Number Guessing

[Dash535]

Hey,

I'm going through the book "Programming: Principles and Practice Using C++" and I am currently on chapter four. I've to make a program where the users chooses a number and the computer is to guess it. One of the rules is it is to guess in no more than seven tries.

Here is my code:

#include <iostream>
#include <string>

using std::cin;
using std::cout;
using std::string;

int main(  )
{
	int lowerBound = 1;
	int median = 0;
	int upperBound = 100;
	string answer;

	// Run through loop until the difference between bounds is 2
	while ( upperBound - lowerBound >= 2 )
	{
		// Calculate halfway point of range
		median = ( lowerBound + upperBound ) / 2;

		cout << "Is your number between " << lowerBound << " and " << median << "? ";
		cin >> answer;

		if ( answer == "y" || answer == "Y" )
		{
			// Number is within range
			upperBound = ( lowerBound + upperBound ) / 2;
		}
		else
		{
			// Number is not within range
			lowerBound = ( lowerBound + upperBound ) / 2;
		}
	}

	// Now there is two numbers, it is either either of them
	cout << "Is your number << " << lowerBound << "? ";
	cin >> answer;

	if ( answer == "y" || answer == "Y" )
	{
		// Number is the lower bound
		cout << "\n\nAnswer is: " << lowerBound << "\n\n";
	}
	else
	{
		// Number is the upper bound
		cout << "\n\nAnswer is: " << upperBound << "\n\n";
	}

    return 0;
}

It guess with 8 or 9 tries. How could I modify it to decrease the number of tries?

Thanks,

Dash535