发牌

/*********************************************************
 * From C PROGRAMMING: A MODERN APPROACH, by K. N. King  *
 * Copyright (c) 1996 W. W. Norton & Company, Inc.       *
 * All rights reserved.                                  *
 * This program may be freely distributed for class use, *
 * provided that this copyright notice is retained.      *
 *********************************************************/

/* deal.c (Chapter 8, page 150) */
/* Deals a random hand of cards */

/*发牌*/

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

#define NUM_SUITS 4   //4个花色
#define NUM_RANKS 13  //每个花色13张牌
#define TRUE 1
#define FALSE 0

typedef int Bool;  //定义新数据类型Bool

main()
{
  Bool in_hand[NUM_SUITS][NUM_RANKS] = {0}; //定义二维数组in_hand 4行13列
  int num_cards, rank, suit;
  const char rank_code[] = {'2','3','4','5','6','7','8',
                            '9','t','j','q','k','a'};  //数组中存13牌
  const char suit_code[] = {'c','d','h','s'};  //数组中存4个花色

  // c,d,h,s代表梅花、红桃 、方片 、黑桃四种花色

  //声明为const的数组不能进行修改
  srand((unsigned) time(NULL));

  //srand函数：初始化C语言的随机数生成器，通过把time函数的返回值传递给srand这种方法
  //可以避免程序在每次运行时发同样的牌

  printf("Enter number of cards in hand: ");
  scanf("%d", &num_cards);

  printf("Your hand:");
  while (num_cards > 0) {
    suit = rand() % NUM_SUITS;     /* picks a random suit */
    rank = rand() % NUM_RANKS;     /* picks a random rank */
    if (!in_hand[suit][rank]) {
      in_hand[suit][rank] = TRUE;  //避免重复选择同一花色的牌
      num_cards--;  //这里是循环条件
      printf(" %c%c", rank_code[rank], suit_code[suit]);//输出每次随机产生的牌
    }
  }
  printf("\n");

  return 0;
}