game.c

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


#define MIN 1
#define MAX 100

/**
 * @brief Pick up a random number between @p min and @p max.
 *
 * @param min the minimum value for the random number.
 * @param max the maximum value for the random number.
 * @return a random number between @p min and @p max
 */
unsigned int
random_number(unsigned int min, unsigned int max);

/**
 * @brief clean stdin to remove extra characters into it.
 */
void clean_buffer(void);


int main(int argc, const char* argv[]) {
        // Initialize the seed for random numbers
        srand(time(NULL));

        // Do we continue playing ?
        char choice = 'n';

        do {
                // Generate a number to guess
                unsigned int secret_number = random_number(MIN, MAX);

                // Number of guesses
                unsigned int guesses = 0;

                // Current shot
                unsigned int input_number = 0;
                do {
                        printf("Take a guess: ");
                        scanf("%d", &input_number);
                        clean_buffer();
                        ++guesses;

                        if(input_number > secret_number) {
                                printf("It is lower!\n");
                        } else if(input_number < secret_number) {
                                printf("It is greater!\n");
                        } else {
                                printf("Congratulations! You took %d "
                                       "guesses to find out the secret "
                                       "number.\n",
                                       guesses);
                        }
                } while(secret_number != input_number);
                printf("Do you want to play again? (y/n) ");
                scanf("%c", &choice);
                clean_buffer();
        } while(choice == 'y');

        return EXIT_SUCCESS;
}


inline unsigned int
random_number(unsigned int min, unsigned int max) {
        return (rand() % (max - min + 1)) + min;
}

inline void
clean_buffer(void) {
        char c;
        while((c = getchar()) != '\n' && c != EOF);
}