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comparing dice

This is a discussion on comparing dice within the C Programming forums, part of the General Programming Boards category; Hello, i am new to the forum, and programming in general. I picked up "C for dummies 2nd edition" as ...

  1. #1
    Don't be a jerk.
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    Question comparing dice

    Hello, i am new to the forum, and programming in general.
    I picked up "C for dummies 2nd edition" as an ebook, and have been working my way through it, using code::blocks.
    Almost done with my initial read through, then i will go back and reread in-depth. So far, i have managed to make a entire yahtzee game, minus the scoring. Could some one show an example of a decent way to compare dice (which are stored as a array)?
    I will post my code that i have done so far:
    Code:
    /* *****************************
     ----------  FILE\  ----------
     changed: 1/17/2013 @ 11:01pm
     main.c , yaht-c
     ----------  /FILE  ----------
     -----------------------------
     ---------- STATUS\ ----------
     Looks like i have to add in
     scoring, and clean up
     code / comments.
     yaht-c can now detect if you
     roll a yahtzee!
     ---------- /STATUS ----------
     -----------------------------
     ---------- TO DO\  ----------
     1.) get scoring working.
     2.) will need a score card.
     ---------- /TO DO  ----------
     -----------------------------
     ---------- IDEAS\  ----------
     1.) dice logo [ Improved ;) ]
     2.) "non standard" yahtzee
         scoring rules? or regular?
     ---------- /IDEAS  ----------
     ***************************** */
    // preprocessor commands
    #include <stdio.h>
    #include <stdlib.h>
    #include <time.h>
    // function prototypes
    void title();//display game title
    void whatdice(int the_dice);//rolls selected dice
    int roll();//roll number 1-3 of the current turn
    void score();//scoring and / or scratching off
    void turn();//keeps calling roll() up to 3 times
    int keep_or_not();//prompts user for which dice to keep, or quit game
    int rnd(int range);//random numbers for the dice are made here
    // global variables
    int roll_n=0;//roll number, 1-3 for the current turn
    int dice_n=0;//keeps track of what dice we are talking about
    int turn_n=0;//turn number
    int dice[5];//array which holds the game dice
    // *****************************
    int main()
    {
    	srand((unsigned)time(NULL));//seed random number generator with clock data
    	short turns;//was int, changed to short, still compiles
    	title();// show the title
    	for(turns = 1;turns<=13;turns++)//13 turns in a standard single player yahtzee game
    	{
            turn();//take another turn
    	}
    	return 0;//all done
    }
    void turn()
    {
    	int score_yet=0;//0 == take another roll, 1 == go score
        score_yet = roll();//first roll
    	if (score_yet == 1)
    	{
    		return;//user held all dice, scored. turn is over, so start the next turn
    	}
    	else
    	{
    		score_yet = roll();//second roll
    	}
    	if (score_yet == 1)
    	{
    		return;//user held all dice, scored. turn is over, so start the next turn
    	}
    	else
    	{
    		score_yet = roll();//third roll. no matter what, the turn is over
    	}
    }
    int rnd(int range)
    {
    	return(rand()%range);//randomness is so random... or is it?
    }
    void whatdice(int the_dice)
    {
    	switch (the_dice)//what dice are we talking about here?
    	{
    		case 1:
    			dice[0] = rnd(6)+1;
    			break;
    		case 2:
    			dice[1] = rnd(6)+1;
    			break;
    		case 3:
    			dice[2] = rnd(6)+1;
    			break;
    		case 4:
    			dice[3] = rnd(6)+1;
    			break;
    		case 5:
    			dice[4] = rnd(6)+1;
    			break;
    		default://this is always done on the first roll of a turn
    			dice[0] = rnd(6)+1;
    			dice[1] = rnd(6)+1;
    			dice[2] = rnd(6)+1;
    			dice[3] = rnd(6)+1;
    			dice[4] = rnd(6)+1;
    			break;
    	}
    }
    int roll()
    {
    	int early=0;//this keeps track of whether we need to score before the third roll of a turn
        if (roll_n==0)
        {
            ++turn_n;//this must mean we are on a new turn
        }
    	fflush(stdin);//clear input
    	roll_n++;//increase the roll count
    	//i like the idea of the score card being where the player can see it at the start of every turn
    	printf("\"yaht-c\", yahtzee game in C\nby Rami Davis.\n");
    	printf("SCORE CARD:1's = | 2's = | 3's = | 4's = | 5's = | 6's = | top bonus = \n           3 of a kind = | 4 of a kind = | full house = | \n           [I know, not finished...]\n");
    	//...will need to be redone so that it is updated as the game goes along
    	printf("turn #: %i\n", turn_n);//what turn is it?
    	printf("roll #: %i\n",roll_n);//and what roll is it of that turn?
    	printf("You rolled: ");
    	if (roll_n==1)
    	{
    		whatdice(0);//on the first roll of every turn, all dice are to be rolled
    	}
    	printf("[%i]   [%i]   [%i]   [%i]   [%i]\n",dice[0],dice[1],dice[2],dice[3],dice[4]);//display the roll
    	if(roll_n==1 || roll_n==2)
    	{
    	    printf("            1^    2^    3^    4^    5^\n");//make sure user knows which dice is which
    		early = keep_or_not();//ask what dice the user wants to keep
    		if(early == 1)//if they kept all dice we go score, then return
    		{
    			printf("Where would you like to score [ or scratch off ] ?: ");
    			score();
    			return early;
    		}
            return early;//if they did NOT keep all dice, early should be 0, the roll is over, so we return
    	}
    	if (roll_n==3)//it is the last roll of the turn. nothing to do but score, then return
        {
            printf("\nWhere would you like to score [ or scratch off ] ?: ");
            score();
    		return early;
        }
    }
    int keep_or_not()
    {
    	int number_held=0;//how many dice has the user decided to keep?
    	for (dice_n = 1; dice_n <=5 ; dice_n++)
    	{
    		printf("for dice %i, keep? (y,Y/n,N  or  q,Q to quit game.)\n",dice_n);//keep a dice? quit the game?
    		fflush(stdin);//flush input
    		char yn;//yes or no
    		yn = getchar();//lets see what the user picks
    		if (yn=='q'||yn == 'Q')
            {
                exit(0);//game over
            }
    		if ((yn == 'y' || yn == 'Y') || ((yn == 'n' || yn == 'N')))//making sure they entered yes or no
    		{
    			if (yn == 'y' || yn == 'Y')
    			{
    				printf("dice %i held\n",dice_n);
    				++number_held;//another dice gets held
    			}
    			if (yn =='n' || yn=='N')
    			{
    				printf("dice %i will be rolled\n",dice_n);
    				int pass = dice_n;
    				whatdice(pass);//that dice is rolled
    			}
    		}
    		else//they did not enter yes, no, or quit, so we ask them again for the same dice.
    		{
    			--dice_n;
    			continue;
    		}
    	}
    	if (number_held == 5)
    	{
    		return 1;//user kept all dice
    	}
    //user did NOT keep all dice
    }
    void score()
    {
    	printf("\nUnder Construction, Sorry :-(\n");
    	if ((dice[0] == dice[1] && dice[2] == dice[3]) && dice[4] == dice[0])//yaht-c!
        {
            printf("YAHT-C!!!\a\a\a\a\a\n");
        }
    	roll_n = 0;//we are done scoring, so we reset the roll counter
    }
    void title()
    {
        int what_title = rnd(6)+1;//two different dice logos based on whether this variable is even or odd
        switch (what_title)
        {
        case 1:
        case 3:
        case 5:
        printf("\a _______  _______  _______  _______  _______ \n|   Y   ||   a . || . h   || . t-. || . C . |\n|   .   ||       ||   .   ||       ||   .   |\n|       || .     ||     . || .   . || .   . |\n -------  -------  -------  -------  ------- \n");//dice logo if odd
            break;
        default:
            printf("\a _______  _______  _______  _______  _______ \n| . Y   ||   a . || . h . || . t-. || . C . |\n|       ||   .   ||       ||   .   || .   . |\n|     . || .     || .   . || .   . || .   . |\n -------  -------  -------  -------  ------- \n");//dice logo
            break;
        }
    }

  2. #2
    Stoned Witch Barney McGrew's Avatar
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    a == b && b == c && c == d && ... may be written recursively like so:

    Code:
    int allequal(const int *ptr, size_t n)
    {
            return n <= 1 ? 1 : ptr[0] == ptr[1] && allequal(ptr + 1, n - 1);
    }
    edit: By the way, calling fflush with an input stream as its argument has undefined behaviour. You should probably consider another method for reading input. If your program is strictly interactive, you might look at readline (which has nice features like history and stuff) if your implementation provides it.
    Last edited by Barney McGrew; 01-18-2013 at 01:10 AM.
    laserlight likes this.

  3. #3
    Don't be a jerk.
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    Hmm. Looks like i need to look up pointers. They skimmed over them in the book. Thanks for the tip, Barney!

  4. #4
    C++ Witch laserlight's Avatar
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    Note the use of tail recursion in Barney McGrew's example. This usually means that it is trivial to replace it with a loop, e.g.,
    Code:
    int allequal(const int *ptr, size_t n)
    {
        size_t i;
        for (i = 1; i < n; ++i)
        {
            if (ptr[i - 1] != ptr[i])
            {
                return 0;
            }
        }
        return 1;
    }
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