#include <windows.h>
#include <stdlib.h>
#include <stdio.h>

void main()
{
    srand( GetTickCount() );
    unsigned int guess = rand() % 100;
    int max = 100;
    int min = 0;
    int guesses = 0;
    char c;

    while( true )
    {
        printf("I guess %d. Am I too high (H), too low (L) or correct (C)? ", guess );
        scanf( "%c", &c );
        switch( c )
        {
        case 'H':
            max = guess;
            guess = ( max + min ) / 2;
            guesses++;
            break;
        case 'L':
            min = guess;
            guess = ( max + min ) / 2;
            guesses++;
            break;
        case 'C':
            printf("Yay! I did it in %d guesses", guesses);
            Sleep( INFINITE );
            break;
        default:
            printf("Not a valid response");
            break;
        }
    }
}