Random guessing game stuck - c

Question

I am practicing the basics of C programming using the book SAMS Teach yourself C in 21 days.
On one of the type and run sections, they have the find the number (or guess the number) program, I typed it and run it, however the program on the console gets stuck showing the following:
Getting a random number
I waited for some time but nothing happens, even pushing some keys it doesn't do anything.
I am not familiar yet with the srand(), time() and rand() routines so I don't know how to fix it and make it run properly.
below is the code:
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define NO 0
#define YES 1
int main (void)
{
int guess_value = -1;
int number;
int nbr_of_guesses;
int done = NO;
printf("\nGetting a random number\n");
/*use the time to seed the random number generator*/
srand( (unsigned) time(NULL));
number = rand();
nbr_of_guesses = 0;
while (done == NO);
{
printf("\nPick a number between 0 and %d>", RAND_MAX);
scanf("%d", &guess_value); /*get a number*/
nbr_of_guesses++;
if (number == guess_value)
{
done = YES;
}
else
if (number < guess_value)
{
printf("\nYou guessed high!");
}
else
{
printf("\nYou guessed low!");
}
}
printf("\nCongratulations! you guessed right in %d Guesses!", nbr_of_guesses);
printf("\n\nThe number was %d", number);
return 0;
}

Answer 1

I can see 2 problems.
There is a semicolon on the while that's causing the program to hang.
There is nothing that ensures that the output buffer is flushed before you read the guess.
I have put comments to indicate the code changes.
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define NO 0
#define YES 1
int main (void)
{
int guess_value = -1;
int number;
int nbr_of_guesses;
int done = NO;
printf("\nGetting a random number\n");
/*use the time to seed the random number generator*/
srand( (unsigned) time(NULL));
number = rand();
nbr_of_guesses = 0;
while (done == NO) // Removed the ;
{
printf("\nPick a number between 0 and %d>", RAND_MAX);
fflush(stdout); // stdout is line buffered, and since there is no \n in the printf we need an explicit call to fflush,
scanf("%d", &guess_value); /*get a number*/
nbr_of_guesses++;
if (number == guess_value)
{
done = YES;
}
else
if (number < guess_value)
{
printf("\nYou guessed high!");
}
else
{
printf("\nYou guessed low!");
}
}
printf("\nCongratulations! you guessed right in %d Guesses!", nbr_of_guesses);
printf("\n\nThe number was %d", number);
return 0;
}