[NBLUG/talk] Request for help--how to program shuffling

[Steve Zimmerman]

The following program will shuffle a vector of 52 cards--once.  The 
second, third, fourth, etc., times that I run the program, it prints 
out exactly the same "random" shuffle as the first time.  

Even if I recompile, it spits out the cards in the same order.

What I'm really after is a program that can take 52 things
and randomly shuffle them *every time I run it*.  Any ideas?

Would yacc and lex maybe be a good idea?

FYI, I'm just doing this for fun, there's no duty involved or
commercial purpose.

#include <stdio.h>
#include <algorithm>
#include <vector>
#include <functional>  
#include <iostream>
#include <iterator>
using namespace std;

int main() {
  	cout << "Illustrating the random_shuffle algorithm." << endl;
  	const int N = 52;
  	vector<int> vector1(N);
  	for (int i = 0; i < N; ++i) 
    	vector1[i] = i + 1;

    	// Randomly shuffle the integers in vector1:
    	random_shuffle(vector1.begin(), vector1.end()); 

	for (int i = 0; i < N; i++) {
		if ((i % 4) == 0)
			printf("\n");
	
		switch(vector1[i]) {
			case 1:  printf("Ace of spades\t"); 	break;
			case 2:  printf("Ace of clubs\t"); 		break;
			case 3:  printf("Ace of hearts\t");		break;
			case 4:  printf("Ace of diamonds\t"); 	break;
			case 5:  printf("King of spades\t"); 	break;
			case 6:  printf("King of clubs\t"); 	break;
			case 7:  printf("King of hearts\t"); 	break;
			case 8:  printf("King of diamonds\t"); 	break;
			case 9:  printf("Queen of spades\t"); 	break;
			case 10: printf("Queen of clubs\t"); 	break;
			case 11: printf("Queen of hearts\t"); 	break;
			case 12: printf("Queen of diamonds\t"); 	break;
			case 13: printf("Jack of spades\t"); 	break;
			case 14: printf("Jack of clubs\t"); 	break;
		        	case 15: printf("Jack of hearts\t"); 	break;
		        	case 16: printf("Jack of diamonds\t"); 	break;
		        	case 17: printf("10 of spades\t"); 	break;
         			case 18: printf("10 of clubs\t"); 		break;
			case 19: printf("10 of hearts\t"); 		break;
			case 20: printf("10 of diamonds\t"); 	break;
			case 21: printf("9 of spades\t"); 		break;
			case 22: printf("9 of clubs\t"); 		break;
			case 23: printf("9 of hearts\t"); 		break;
			case 24: printf("9 of diamonds\t"); 	break;
			case 25: printf("8 of spades\t"); 		break;
			case 26: printf("8 of clubs\t"); 		break;
			case 27: printf("8 of hearts\t"); 		break;
			case 28: printf("8 of diamonds\t"); 	break;
			case 29: printf("7 of spades\t"); 		break;
			case 30: printf("7 of clubs\t"); 		break;
			case 31: printf("7 of hearts\t"); 		break;
			case 32: printf("7 of diamonds\t"); 	break;
			case 33: printf("6 of spades\t"); 		break;
			case 34: printf("6 of clubs\t"); 		break;
			case 35: printf("6 of hearts\t"); 		break;
			case 36: printf("6 of diamonds\t"); 	break;
			case 37: printf("5 of spades\t"); 		break;
			case 38: printf("5 of clubs\t"); 		break;
			case 39: printf("5 of hearts\t"); 		break;
			case 40: printf("5 of diamonds\t");	break;
			case 41: printf("4 of spades\t"); 		break;
			case 42: printf("4 of clubs\t"); 		break;
			case 43: printf("4 of hearts\t"); 		break;
			case 44: printf("4 of diamonds\t"); 	break;
			case 45: printf("3 of spades\t"); 		break;
			case 46: printf("3 of clubs\t"); 		break;
			case 47: printf("3 of hearts\t"); 		break;
			case 48: printf("3 of diamonds\t"); 	break;
			case 49: printf("2 of spades\t"); 		break;
			case 50: printf("2 of clubs\t"); 		break;
			case 51: printf("2 of hearts\t"); 		break;
			case 52: printf("2 of diamonds\t"); 	break;
		}
	}
	return 0;
}