good.c

linux下的Ｃ语言开发

/********************************************************
 * guess -- a simple guessing game                      *
 *                                                      *
 * Usage:                                               *
 *      guess                                           *
 *                                                      *
 *      A random number is chosen between 1 and 100.    *
 *      The player is given a set of bounds and         *
 *      must choose a number between them.              *
 *      If the player chooses the correct number he wins*
 *      Otherwise the bounds are adjusted to reflect    *
 *      the player's guess and the game continues.      *
 *                                                      *
 *                                                      *
 * Restrictions:                                        *
 *      The random number is generated by the statement *
 *      rand() % 100.  Because rand() returns a number  *
 *      0 <= rand() <= maxint  this slightly favors     *
 *      the lower numbers.                              *
 ********************************************************/
#include <stdio.h>
#include <stdlib.h>   
int   number_to_guess;  /* random number to be guessed */
int   low_limit;        /* current lower limit of player's range */
int   high_limit;       /* current upper limit of player's range */
int   guess_count;      /* number of times player guessed */
int   player_number;    /* number gotten from the player */
char  line[80];         /* input buffer for a single line */
int main()
{
    while (1) {
        /*
         * Not a pure random number, see restrictions 
         */
        number_to_guess = rand() % 100 + 1;

        /* Initialize variables for loop */
        low_limit = 0;
        high_limit = 100;
        guess_count = 0;

        while (1) {
            /* tell user what the bounds are and get his guess */
            printf("Bounds %d - %d\n", low_limit, high_limit);
            printf("Value[%d]? ", guess_count);

            ++guess_count;

            fgets(line, sizeof(line), stdin);
            sscanf(line, "%d", &player_number);

            /* did he guess right? */
            if (player_number == number_to_guess)
                break;

            /* adjust bounds for next guess */
            if (player_number < number_to_guess)
                low_limit = player_number;
            else
                high_limit = player_number;

        }
        printf("Bingo\n");
    }
}