Blackjack-like game. Requires C++11. >g++ -std=gnu++11 -o blackjack ./blackjack.cpp

blackjack.cpp

#include <cstdio>
#include <vector>
#include <algorithm>
#include <random>
#include <string>
#define FOR(i,m,n) for(int i=m;i<(int)(n);i++)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
using namespace std;

vector<int> range(int end){
  vector<int> res;
  REP(i,end)
    res.push_back(i);
  return res;
}

int getCardNum(int num){
  return num % 13 + 1;
}

int getCard(vector<int>& from){
  int card = from.front();
  from.erase(from.begin());
  return card;
}

int getPoint(int num){
  int card = getCardNum(num);
  if(card >= 10) return 10;
  else return card;
}

int main(){
  vector<int> cards = range(52); // without joker.
  vector<int> playerHands, enemyHands;
  int playerPoint, enemyPoint;
  random_device rd;
  mt19937 g(rd());

  shuffle(ALL(cards), g);
  REP(i,2){
    playerHands.push_back(getCard(cards));
    enemyHands.push_back(getCard(cards));
  }

  // player's turn.
  printf("It's your turn.\n");
  printf("One of enemy's hands is %d.\n",getCardNum(enemyHands.front()));
  bool turnEnd = false;
  while(!turnEnd){
    char input;
    playerPoint = 0;
    printf("You have ");
    REP(i,playerHands.size()){
      printf("%d",getCardNum(playerHands[i]));
      playerPoint += getPoint(playerHands[i]);
      if(i < playerHands.size()-1) printf(",");
    }
    printf(".\nYour point is %d.\n",playerPoint);
    if(playerPoint > 21){
      printf("Burst!!\nYou lose!!\n");
      playerPoint = 0;
      return 0;
    }
    printf("Choose what you do.\nh: Hit. s: Stand.\n > ");
    input = getchar();
    switch(input){
      case 'h':
        printf("You hit.\n");
        playerHands.push_back(getCard(cards));
        break;
      case 's':
        printf("You stood.\n");
        turnEnd = true;
        break;
      default:
        break;
    }
  }
  // enemy's turn.
  printf("\nIt's enemy's turn.\n");
  turnEnd = false;
  while(!turnEnd){
    enemyPoint = 0;
    REP(i,enemyHands.size())
      enemyPoint += getPoint(enemyHands[i]);
    if(enemyPoint > 21){
      printf("Burst!! His point is %d!!\nYou win!!\n",enemyPoint);
      return 0;
    }
    if(enemyPoint <= playerPoint){
      printf("He hit.\n");
      enemyHands.push_back(getCard(cards));
      continue;
    }else{
      printf("He stood.\n");
      turnEnd = true;
    }
  }
  printf("\nYour point is %d.\n", playerPoint);
  printf("Enemy's point is %d.\n\n", enemyPoint);
  if(playerPoint < enemyPoint)
    printf("You lose!!\n");
  else if(playerPoint > enemyPoint)
    printf("You win!!\n");
  else
    printf("Draw!!\n");
  return 0;
}