blackjack.c

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

int shuff(int cards[])
{
	
	int t;
	int i;
	int desk[52];	
	for (i=0;i<52;i++)
		desk[i] = (i/13+3)*100 + i%13 + 1;

	srand(time(NULL));
	for (i = 0; i < 52; i++)
	{
		do
		{
			t = rand() % 52;
		} while (desk[t] == 0);
		cards[i] = desk[t];
		desk[t] = 0;
	}
	
	return 0;
}

int convert_jkq(int a)
{
	if ((a%100==11) ||(a%100==12) ||(a%100==13)) return (a/100)*100+10;
	else return a;
}

void pic(int num)
{
	char fl;
	int po_num;
	
	fl = num / 100;
	po_num = num % 100;
	switch (po_num)
	{
		case 1: 
		{
			printf("*******\n");
			printf("*     *\n");
			printf("* %c   *\n", fl);
			printf("*   A *\n");
			printf("*     *\n");
			printf("*******\n");
			break;
		}
		case 2:
		case 3:
		case 4:
		case 5:
		case 6:
		case 7:
		case 8:
		case 9:
		case 10:
		{
			printf("*******\n");
			printf("*     *\n");
			printf("* %c   *\n", fl);
			printf("*  %2d *\n", po_num);
			printf("*     *\n");
			printf("*******\n");
			break;
		}
		case 11:
		{
			printf("*******\n");
			printf("*     *\n");
			printf("* %c   *\n", fl);
			printf("*   J *\n");
			printf("*     *\n");
			printf("*******\n");
			break;
		}
		case 12:
		{
			printf("*******\n");
			printf("*     *\n");
			printf("* %c   *\n", fl);
			printf("*   Q *\n");
			printf("*     *\n");
			printf("*******\n");
			break;
		}
		case 13:
		{
			printf("*******\n");
			printf("*     *\n");
			printf("* %c   *\n", fl);
			printf("*   K *\n");
			printf("*     *\n");
			printf("*******\n");
			break;
		}

	}
}

int play(void)
{
	int i;
	int psum=0;
	int bsum=0;
	int pcards[5]={0};
	int bcards[5]={0};
	int cards[52];
	char go_on;
	char d;
	
	printf("Welcome to SimpleBlackJack!\n"
	"Anytime you can press Ctrl+C to exit.\n"
	"Enjoy! Press Enter to go on......\n");
	do{
		go_on = getchar();
	} while (go_on != '\n');
	printf("\n");
	
	//shuff the cards
	shuff(cards);

	//give the cards
	pcards[0]=cards[0];
	pcards[1]=cards[1];
	bcards[0]=cards[2];
	bcards[1]=cards[3];
	
	//the 2 cards player get
	printf("One of computer's cards:\n");
	pic(bcards[0]);
	printf("\n");
	printf("Cards of player:\n");
	pic(pcards[0]);
	//printf("\n");
	pic(pcards[1]);
	//printf("\n");
	
	i=0;
	for (i=0; i<2; i++)
	{
		if (pcards[i]%100 == 1)
		{
			printf("choose A value of the card %d, input 'y' for 11 or 'n' for 1 :\n", i+1);
			do{
				d = getchar();
			} while (d!='y' && d!='n');
			
			if (d == 'y')
			{
				printf("You've chosen value 11 for card A.\n");
				psum = psum + 11;
			}
			else if(d == 'n')
			{
				printf("You've chosen value 1 for card A.\n");
				psum = psum +1;
			}
		}
		else if (convert_jkq(pcards[i]) %100 ==10) psum = psum + 10;
		else psum = psum + pcards[i]%100;
		
		if (psum > 21)
		{
			printf("Sum of player's cards now:%d\n\n",psum);
			printf("Computer win!\n");
			return 1;
		}
		else if (psum == 21)
		{
			printf("Sum of player's cards now:%d\n\n",psum);
			printf("Player win!\n");
			return 0;
		}
	}
	printf("Sum of player's cards now:%d\n\n",psum);
	
	//whether player get another cards
	i=0;
	for (i=0; i<3; i++)
	{
		char j = 'n';
		
		printf("Want more cards? Input y or n:\n");
		do{
			j = getchar();
		} while (j!='y' &&j!='n');
		
		if (j=='y')
		{
			printf("You've got another card now.\n");
			pcards[i+2]=cards[i+4];
			printf("and your card %d is:\n", i+3);
			pic(pcards[i+2]);
			
			if (pcards[i+2]%100 == 1)
			{
				printf("Choose A value of the card %d, input 'y' for 11 or 'n' for 1:\n", i+3);
				do{
					d = getchar();
				} while (d!='y' && d!='n');	
				if (d == 'y')
				{
					printf("You've chosen value 11 for card A.\n");
					psum = psum + 11;
				}
				else if(d == 'n')
				{
					printf("You've chosen value 1 for card A.\n");
					psum = psum +1;
				}
			}
			else if (convert_jkq(pcards[i+2]) %100 ==10) psum = psum + 10;
			else psum = psum + pcards[i+2]%100;
			
			if (psum > 21)
			{
				printf("Sum of player's cards now:%d\n\n",psum);
				printf("Computer win!\n");
				return 1;
			}
			else if (psum == 21)
			{
				printf("Sum of player's cards now:%d\n\n",psum);
				printf("Player win!\n");
				return 0;
			}		
			else printf("Sum of player's cards now:%d\n\n",psum);
		}
		else 
		{
			printf("Sum of player's cards now:%d\n\n",psum);
			break;
		}
	}
	if (i == 3)
	{
		printf("Player win! Because the sum of your 5 cards is no larger than 21! So lucky!\n");
		return 0;
	}
	
	//the 2 cards of boss/computer
	//i=0;
	printf("Computer's cards:\n");
	pic(bcards[0]);
	pic(bcards[1]);

	if (bcards[0]%100 + bcards[1]%100 == 2)
	{
		bsum=12; //two A cards
		printf("Sum of computer's cards now:%d\n\n", bsum);
	}
	else if ((convert_jkq(bcards[0]))%100 + (convert_jkq(bcards[1]))%100 ==1)
	{
		bsum=21;
		printf("Sum of computer's cards now:%d\n\n", bsum);
		printf("Computer win!\n");
		return 1;
	}
	else if (bcards[0]%100==1 || bcards[1]%100==1)
	{
		bsum=(bcards[0]+bcards[1])%100+(rand()%2)*10;
		printf("Sum of computer's cards now:%d\n\n", bsum);
	}
	else
	{
		bsum = (convert_jkq(bcards[0]))%100 + (convert_jkq(bcards[1]))%100;
		printf("Sum of computer's cards now:%d\n\n", bsum);
	}
	
	//whether computer get another cards until bsum>16
	//i=0;
	for (i=0; i<3 && bsum<17; i++)
	{
		bcards[i+2]=cards[i+7];
		printf("Computer's card %d is:\n", i+3);
		pic(bcards[i+2]);
		
		if (bcards[i+2]%100 == 1)
		{
			if (bsum+11 <= 21)
			{
				printf("Computer has chosen A as 11\n");
				bsum = bsum+11;
				printf("Sum of computer's cards now:%d\n\n", bsum);
			}
			else
			{
				printf("Computer has chosen A as 1\n");
				bsum = bsum+1;
				printf("Sum of computer's cards now:%d\n\n", bsum);
			}
		}
		else
		{
			bsum = bsum + convert_jkq(bcards[i+2])%100;
			printf("Sum of computer's cards now:%d\n\n", bsum);
		}
	}
	if (i == 3)
	{
		printf("Computer win! Because the sum of its 5 cards is no larger than 21! So lucky!\n");
		return 1;
	}
	
	//the last step
	if (bsum>21 || psum>bsum)
	{
		printf("Player win!\n");
		return 0;
	}
	else if (psum == bsum)
	{
		printf("Oh, player and computer get the same score!\n");
		return 3;
	}
	else if (psum < bsum)
	{
		printf("Computer win!\n");
		return 1;
	}
		
	return 3;
}

int main(void)
{
	char again;
  
	play();
  
	printf("\nAnd now would you like to play again? Input 'y' or 'n':\n");
	do{
		again = getchar();
	} while (again!='y' && again!='n');
   
	if (again == 'y')
	{
		printf("\nOK, let's go again!\n\n");
		main();
	}
  
	return 0;
}