模拟扑克牌发牌

一个模拟抽牌的过程

#include <iostream>
#include <cstdlib>
#include <ctime>
#include <cmath> 
using namespace std;

int rand_0toN1(int n);
void draw_a_card();
int select_next_available(int n);

char *suits[4] ={"hearts","diamonds","spades","clubs"};
char *ranks[13]={"ace","two","three","four","five","six","seven","eight",
                  "night","ten","jack","queen","king"};
bool card_drawn[52];
int cards_remaining=52;

int main() {
	int n,i;
	srand(time(NULL)); 
 

       while(true){
		cout<<"Enter no. of cards to draw";
		cout<<"(0 to exit): ";
		cin>>n;
		if(n==0)
		{
			cout<<n<<endl;
			break;
		}
		 
		for(i=1;i<=n;i++)
		 draw_a_card();
	}
	return 0;
}


void draw_a_card(){
	int r;
	int s;
	int card,n;
	if(cards_remaining == 0){
		cout<<"Reshufing."<<endl;
		cards_remaining=52;
		for(int i = 0;i<52;i++)
		card_drawn[i]=false;
	}
	n=rand_0toN1(cards_remaining--);
	card=select_next_available(n);
	r=card % 13;	
	s=card / 13;
	cout<<ranks[r]<<" of "<<suits[s]<<endl;
}

int select_next_available(int n){
	int i=0;
	while(card_drawn[i])
	{
	  i++;
	}
	
	while(n-->0){
		i++;
		while(card_drawn[i])
			i++;
	}
	card_drawn[i]=true;
	return i;
}

int rand_0toN1(int n){
	return rand() % n;
}