C++ :: Number Guessing Game Binary Search

Basically i need to make a number guessing game where user thinks of a numbver from 1 - 100 and the machine will try to guess it in the least number of times. Once it guesses the number it will also say how many tries it took to guess.

My code so far is

#include<iostream>
using namespace std;
const int MAX = 100;
int main() {
char ch;

cout << "Think of an integer number between 0 and " << MAX<<endl;
cout << "Write it down on a piece of paper then hit a key to continue"<<endl<<endl;
cin.get(ch);

[Code] ....