Reverse guessing game

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <time.h>

#define TRUE 1
#define FALSE 0

// Function: print_greeting
// This function prints out the greeting for the game
void print_greeting(int min,     // Received: minimum possible guess value
                    int max,     // Received: maximum possible guess value
                    int guesses);// Received: maximum number of computer guesses

// Function: user_wishes_to_continue
// Returns: true(1) if user responds with y
// Returns: false(0) if user responds with n
int user_wishes_to_continue();

// Function: prompt_user
// Tells the computer if it's guess is too H, L, or correct
// char response  Returned: the user's response to the guess
char prompt_user(int guess);    // Received: computer's guess

// Function: print_results
// Prints the number of wins by the user and an ending message
void print_results(int comp_wins, // Received: number of computer wins
                  int user_wins);// Received: number of user wins
// Function: play_game
// play one game of the reverse guessing game
// int(boolean) has_won Returned: result of game
void play_game(int min, int max, int guesses);

int main()
{
    srand(time(0)); // seeds the random number generator with
                    // time - # seconds since some fixed point


    // 1. Print the program banner
    print_greeting(1, 1000, 5);


    // 2. Initialize the counter variables to 0

    // 3. In a loop, play a game using the play_game function,
    //    and increment the win count of the winner of the game
    //    until the user does not wish to continue.
        play_game(1, 1000, 5);
    // 4. Print the results and ending message using the print_results function
    // 5. Return 0 to exit the program
    return 0;
}

void print_greeting(int min, int max, int guesses)
{
    printf("Welcome to the (reverse) guessing game.\n");
    printf("Choose a number between %d and %d inclusive\n", min, max);
    printf("and I will try to guess it in %d or fewer tries\n", guesses);
}

int user_wishes_to_continue()
{
    char response;
    do
    {
        printf("Do you wish to continue? (y/n) ");
        scanf(" %c", &response);
        response = tolower(response);
        if (response != 'y' && response != 'n')
            printf("Bad input. Try again.\n");
    }
    while (response != 'y' && response != 'n');


    return response == 'y';
}

char prompt_user(int guess)
{   guess = 500;
    char response;
    printf("\nMy guess is %d.\n", guess);
    do
    {
        printf("Is my guess too (H)igh, too (L)ow, or (E)qual to your number? ");
        scanf(" %c", &response);
        response = toupper(response);
        if (response != 'H' && response != 'L' && response != 'E')
            printf("Bad input. Try again.\n");

    } while (response != 'E');
    return response == 'E';
}
void print_results(int comp_wins, int user_wins)
{
    printf("I won %d game(s).\n", comp_wins);
    printf("You won %d game(s).\n", user_wins);
    printf("Thank you for playing!");
}
void play_game(int min, int max, int guesses)
{
    int low,    // when guess is too low
        high,   // when guess is too high
        num_guesses,  // number of guesses taken by the computer
        guess,
        has_won;
        num_guesses = 0;
    char response;
    min = low;
    max = high;
    has_won = FALSE;
    response = prompt_user(guess);

    while(response != 'E' && num_guesses !=5)
    {
        prompt_user(guess);
            if (response == 'H')
            {
             high = guess - 1 ;
             guess = (high + low)/2;
             prompt_user(guess);
             printf("My guess is %d.\n", guess);
            }
            else if (response == 'L')
            {
              low = guess + 1;
              guess = (high + low)/2;
              prompt_user(guess);
              printf("My guess is %d.\n", guess);
            }

    }


}