我正在尝试为Blackjack游戏构建代码，我遇到了以下问题：
我希望代码在重新洗牌之前不要多次使用同一张卡（再次重新加载所有52张卡）。
#include<iostream>
#include<string>
#include <ctime>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
using namespace std;
class play_cards
{
public:
play_cards::play_cards();
void play_cards::load();
void play_cards::printdeck();
void play_cards::startGame();
void play_cards::reshuffle();
void play_cards::check();
private:
struct deck
{
string card_name;
string card_type;
int card_value;
bool dealt;
};
deck card[52];
int i,random, counter ;
double Total;
};
int main()
{ string start="";
cout<<endl<<endl;
cout<<"The Rules are as Following:"<<endl<<endl;
cout<<"1. The dealer gives one card face up to each player, "<<endl;
cout<<" and then one card face up to himself."<<endl;
cout<<"2. Another round of cards is then dealt face up to each player, "<<endl;
cout<<" but the dealer takes his second card face down. "<<endl;
cout<<"3. Each player must decide whether to "<<endl;
cout<<" stand (not ask for another card) "<<endl;
cout<<" OR "<<endl;
cout<<" hit (ask for another card ) "<<endl;
cout<<"4. Each player attempts to beat the dealer by getting a count closer to 21, "<<endl;
cout<<" without going over 21. "<<endl;
cout<<"5. When the dealer has served the player, his face-down card is turned up. "<<endl;
cout<<" If the total is 17 or more, he must stand. 16 or under, he takes a card. "<<endl;
cout<<"6. If the dealer has an ace, and counting it as 11 would bring his total to 17"<<endl;
cout<<" or more (but not over 21), he must count the ace as 11 and stand. "<<endl;
cout<<"7. The dealer's decisions, then, are automatic on all plays, "<<endl;
cout<<" whereas the player always has the option of taking one or more cards. "<<endl;
cout<<endl<<endl;
play_cards value;
cout<< "Do you want to Start Playing ? (yes / no)"<<endl<<endl;
cin>>start;
if(start=="yes"){
value.startGame();
}
//value.printdeck();
system("pause");
return 0;
}
play_cards::play_cards()
{
random=0;
counter=0;
Total=0;
}
void play_cards::load()
{
card[0].card_name="TWO";
card[0].card_type="heart";
card[0].card_value=2;
card[0].dealt=false;
card[1].card_name="THREE";
card[1].card_type="heart";
card[1].card_value=3;
card[1].dealt=false;
card[2].card_name="FOUR";
card[2].card_type="heart";
card[2].card_value=4;
card[2].dealt=false;
card[3].card_name="FIVE";
card[3].card_type="heart";
card[3].card_value=5;
card[3].dealt=false;
card[4].card_name="SIX";
card[4].card_type="heart";
card[4].card_value=6;
card[4].dealt=false;
card[5].card_name="SEVEN";
card[5].card_type="heart";
card[5].card_value=7;
card[5].dealt=false;
card[6].card_name="EIGHT";
card[6].card_type="heart";
card[6].card_value=8;
card[6].dealt=false;
card[7].card_name="NINE";
card[7].card_type="heart";
card[7].card_value=9;
card[7].dealt=false;
card[8].card_name="TEN";
card[8].card_type="heart";
card[8].card_value=10;
card[8].dealt=false;
card[9].card_name="ACE";
card[9].card_type="heart";
card[9].card_value=1;
card[9].dealt=false;
card[10].card_name="JACK";
card[10].card_type="heart";
card[10].card_value=10;
card[10].dealt=false;
card[11].card_name="QUEEN";
card[11].card_type="heart";
card[11].card_value=10;
card[11].dealt=false;
card[12].card_name="KING";
card[12].card_type="heart";
card[12].card_value=10;
card[12].dealt=false;
card[13].card_name="TWO";
card[13].card_type="diamond";
card[13].card_value=2;
card[13].dealt=false;
card[14].card_name="THREE";
card[14].card_type="diamond";
card[14].card_value=3;
card[14].dealt=false;
card[15].card_name="FOUR";
card[15].card_type="diamond";
card[15].card_value=4;
card[15].dealt=false;
card[16].card_name="FIVE";
card[16].card_type="diamond";
card[16].card_value=5;
card[16].dealt=false;
card[17].card_name="SIX";
card[17].card_type="diamond";
card[17].card_value=6;
card[17].dealt=false;
card[18].card_name="SEVEN";
card[18].card_type="diamond";
card[18].card_value=7;
card[18].dealt=false;
card[19].card_name="EIGHT";
card[19].card_type="diamond";
card[19].card_value=8;
card[19].dealt=false;
card[20].card_name="NINE";
card[20].card_type="diamond";
card[20].card_value=9;
card[20].dealt=false;
card[21].card_name="TEN";
card[21].card_type="diamond";
card[21].card_value=10;
card[21].dealt=false;
card[22].card_name="ACE";
card[22].card_type="diamond";
card[22].card_value=1;
card[22].dealt=false;
card[23].card_name="JACK";
card[23].card_type="diamond";
card[23].card_value=10;
card[23].dealt=false;
card[24].card_name="QUEEN";
card[24].card_type="diamond";
card[24].card_value=10;
card[24].dealt=false;
card[25].card_name="KING";
card[25].card_type="diamond";
card[25].card_value=10;
card[25].dealt=false;
card[26].card_name="TWO";
card[26].card_type="spade";
card[26].card_value=2;
card[26].dealt=false;
card[27].card_name="THREE";
card[27].card_type="spade";
card[27].card_value=3;
card[27].dealt=false;
card[28].card_name="FOUR";
card[28].card_type="spade";
card[28].card_value=4;
card[28].dealt=false;
card[29].card_name="FIVE";
card[29].card_type="spade";
card[29].card_value=5;
card[29].dealt=false;
card[30].card_name="SIX";
card[30].card_type="spade";
card[30].card_value=6;
card[30].dealt=false;
card[31].card_name="SEVEN";
card[31].card_type="spade";
card[31].card_value=7;
card[31].dealt=false;
card[32].card_name="EIGHT";
card[32].card_type="spade";
card[32].card_value=8;
card[32].dealt=false;
card[33].card_name="NINE";
card[33].card_type="spade";
card[33].card_value=9;
card[33].dealt=false;
card[34].card_name="TEN";
card[34].card_type="spade";
card[34].card_value=10;
card[34].dealt=false;
card[35].card_name="ACE";
card[35].card_type="spade";
card[35].card_value=1;
card[35].dealt=false;
card[36].card_name="JACK";
card[36].card_type="spade";
card[36].card_value=10;
card[36].dealt=false;
card[37].card_name="QUEEN";
card[37].card_type="spade";
card[37].card_value=10;
card[37].dealt=false;
card[38].card_name="KING";
card[38].card_type="spade";
card[38].card_value=10;
card[38].dealt=false;
card[39].card_name="TWO";
card[39].card_type="club";
card[39].card_value=2;
card[39].dealt=false;
card[40].card_name="THREE";
card[40].card_type="club";
card[40].card_value=3;
card[40].dealt=false;
card[41].card_name="FOUR";
card[41].card_type="club";
card[41].card_value=4;
card[41].dealt=false;
card[42].card_name="FIVE";
card[42].card_type="club";
card[42].card_value=5;
card[42].dealt=false;
card[43].card_name="SIX";
card[43].card_type="club";
card[43].card_value=6;
card[43].dealt=false;
card[44].card_name="SEVEN";
card[44].card_type="club";
card[44].card_value=7;
card[44].dealt=false;
card[45].card_name="EIGHT";
card[45].card_type="club";
card[45].card_value=8;
card[45].dealt=false;
card[46].card_name="NINE";
card[46].card_type="club";
card[46].card_value=9;
card[46].dealt=false;
card[47].card_name="TEN";
card[47].card_type="club";
card[47].card_value=10;
card[47].dealt=false;
card[48].card_name="ACE";
card[48].card_type="club";
card[48].card_value=1;
card[48].dealt=false;
card[49].card_name="JACK";
card[49].card_type="club";
card[49].card_value=10;
card[49].dealt=false;
card[50].card_name="QUEEN";
card[50].card_type="club";
card[50].card_value=10;
card[50].dealt=false;
card[51].card_name="KING";
card[51].card_type="club";
card[51].card_value=10;
card[51].dealt=false;
}
void play_cards::printdeck()
{
//loop to print all cards
for (i=0; i<=51; ++i)
{
if((i==13)||(i==26)||(i==39))
cout<<endl;
cout<<card[i].card_name<<" "<<card[i].card_type<<" " <<card[i].card_value<<" " +card[i].dealt<<endl;
}//for loop
}
void play_cards::reshuffle()
{
cout<<"**********"<<endl<<
"The Cards has been reshuffled"<<endl<<
"**********"<<endl;
for (i=0; i<=51; ++i)
{
card[i].dealt=false;
}
counter =0;
}
你可以查看这个功能吗
void play_cards::check()
{
srand(time(NULL));
random= rand() %53; //number between 0 and 53
while(card[random].dealt!=0)
{
srand(time(NULL));
random= rand() %53;
}
if(!card[random].dealt)
{
counter =counter+1;
}
if(counter==37)
{
reshuffle();
}
}
void play_cards::startGame()
{
cout<<endl<<endl;
int player_wins = 0;
int computer_wins = 0;
string choice = "";
string playerOption = "";
while(choice!="No")
{
bool player_flag = false;
int player_score = 0;
int computer_score = 0;
load();
check();
player_score = player_score + card[random].card_value;
cout<<"Player draws: "<< card[random].card_name<<" "<<card[random].card_type <<endl<<"Score becomes: "<<player_score<<endl<<endl;
card[random].dealt=1;
check();
computer_score = computer_score + card[random].card_value;
cout<<"Dealer draws: "<< card[random].card_name<<" "<<card[random].card_type<<endl<< "Score becomes: "<<computer_score<<endl<<endl;
card[random].dealt=1;
check();
player_score = player_score + card[random].card_value;
cout<<"Player draws: "<< card[random].card_name<<" "<<card[random].card_type <<endl<<"Score becomes: "<<player_score<<endl<<endl;
card[random].dealt=1;
check();
computer_score = computer_score + card[random].card_value;
int hidden = random;
cout<<"Dealer draws but the value will be shown later " <<endl<<endl;
card[random].dealt=1;
cout<<"You want to hit or stand? "<<endl<<endl;
cin>>playerOption;
while(playerOption!="stand")
{
if(playerOption=="hit")
{
check();
player_score = player_score + card[random].card_value;
cout<<"Player draws: "<< card[random].card_name<<" "<<card[random].card_type <<endl<<" Score becomes: "<<player_score<<endl<<endl;
card[random].dealt=1;
if(player_score>21)
{
cout<<"Player Loses"<<endl;
computer_wins=computer_wins+1;
player_flag = true;
break;
}
if(player_score==21)
{
cout<<"Player Wins!!"<<endl;
player_wins=player_wins+1;
player_flag=true;
break;
}
}
cout<<"You want to hit or stand? "<<endl;
cin>>playerOption;
}
if(!player_flag)
{
cout<<"Dealer hidden card is: "<< card[hidden].card_name<<" "<<card[hidden].card_type<< "\nScore becomes: "<<computer_score<<endl<<endl;
bool computer_flag = false;
while(computer_score<17)
{
check();
if(card[random].card_name=="ACE")
{
if(((computer_score+11) >= 17 ) && ((computer_score+11)<=21))
{
computer_score = computer_score+11;
break;
}
else
{
computer_score= computer_score+1;
}
}
else
{
computer_score = computer_score+card[random].card_value;
}
cout<<"Dealer draws: "<< card[random].card_name<<" "<<card[random].card_type <<endl<<"Score becomes: "<<computer_score<<endl<<endl;
card[random].dealt=1;
if(computer_score>21)
{
cout<<"Dealer loses!!"<<endl;
player_wins=player_wins+1;
computer_flag= true;
break;
}
if(computer_score==21)
{
cout<<"Dealer Wins!!"<<endl;
computer_wins=computer_wins+1;
computer_flag = true;
break;
}
}
if(!computer_flag)
{
if(computer_score>player_score)
{
cout<<"Dealer Wins!!"<<endl;
computer_wins=computer_wins+1;
}
else
{
if(computer_score<player_score)
{
cout<<"Player Wins!!"<<endl;
player_wins=player_wins+1;
}
else
{
cout<<"Nobody wins or loses"<<endl;
}
}
}
}
Total=Total+1;
cout<<"counter ="<<counter<<endl;
cout<<" Do you want to play again? (Yes / No)"<<endl;
cin>>choice;
}
cout<<endl<<endl;
cout<<"Final Summary:"<<endl<<endl;
cout<<"Total Number of played games: "<<Total<<endl;
cout<<"Player Wins: "<<player_wins<<endl;
cout<<"Computer Wins: "<<computer_wins<<endl;
cout<<"The percentage of wins for the playes: "<<(player_wins/Total)*100<<"%"<<endl;
}
答案 0 :(得分：1)
你在这里弄乱了一些概率。一开始你有52张牌，所以你使用rand（）％52得到0到51之间的数字（http://www.cplusplus.com/reference/cstdlib/rand/）。这是正确的，因为每张卡的提取概率是1/52。
然而，随着卡越来越少，提取单张卡的可能性必须相应提高。此外，您的解决方案效率低下，因为当只剩下一张卡时，您将继续提取，直到您无法获得正确的价值浪费大量时间。
您可以将此问题重新考虑为随机置换有限集，可以使用 Knuth shuffle 解决，这很容易实现。链接到维基百科：https://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle