How to write a Mastermind game without using array and pointer?

This is a discussion on How to write a Mastermind game without using array and pointer? within the C Programming forums, part of the General Programming Boards category; By the way, in my case, you could move the "g != 0" part to become a "if (g !=0)" ...

  1. #31
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    By the way, in my case, you could move the "g != 0" part to become a "if (g !=0)" outside the inner for-loop, so the whole loop is not run when the guess has already been used up.

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  2. #32
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    I've written another version, this one should contain no bug and is easier for users to understand, it's just for fun

    Code:
    #include<stdio.h>
    
    
    main()
    {
    	srand(time(NULL));
    	int c,g,i,j,b;
    	
    
    	for (i = 1; i <= 4; i++)
    	{
    		c = rand();
    		scanf("&#37;d",&g);
                                    if (g == c)
    		{
    			b = true;
    		}	
    	}
    	
    		
    
    }
    Last edited by wtxwt; 10-24-2007 at 09:51 AM.

  3. #33
    C++ Witch laserlight's Avatar
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    I've written another version, this one should contain no bug and is easier for users to understand, it's just for fun
    Have you tested your program yet? You have a couple of array index out of bounds errors, at the very least.
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  4. #34
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    Someone has written another version in another forum, I think it's better than mine, simple and efficient

    Code:
    #include <stdio.h>
    
    int main()
    {
      int answer = 0;
      int guess;
      int black = 0;
      int white = 0;
      int round = 1;
      int a1, a2, a3, a4;  
      int g1, g2, g3, g4;  
      int i;
    
      srand(time(NULL));
      for (i = 0; i < DIGIT_COUNT; ++i) {
        answer *= 10;
        answer += rand() &#37; DIGIT_LENGTH + MIN_DIGIT;
      }
      printf("The answer is %d\n", answer);
      for (round = 1; black != DIGIT_COUNT && round <= MAX_ROUND; ++round) {
        int workAnswer;
        int workGuess;
        int validInput;
    
        do {
          printf("Round %2d: Your guess (-1 to quit): ", round);
          validInput = scanf("%d", &guess);
          if (validInput == 0) {
            fflush(stdin);
            puts("Invalid input. Please enter again.");
          }
        } while (!validInput);
        if (guess == -1)
          break;
    
    
        a1 = a2 = a3 = a4 = 0;
        g1 = g2 = g3 = g4 = 0;
        black = 0;
        workAnswer = answer;
        workGuess = guess;
        if (workAnswer % 10 == workGuess % 10) {
          ++black;
          a1 = g1 = 1;
        }
        workAnswer /= 10;
        workGuess /= 10;
        if (workAnswer % 10 == workGuess % 10) {
          ++black;
          a2 = g2 = 1;
        }
        workAnswer /= 10;
        workGuess /= 10;
        if (workAnswer % 10 == workGuess % 10) {
          ++black;
          a3 = g3 = 1;
        }
        workAnswer /= 10;
        workGuess /= 10;
        if (workAnswer % 10 == workGuess % 10) {
          ++black;
          a4 = g4 = 1;
        }
    
        white = 0;
        workGuess = guess;
    
        
        if (g1 == 0) {
          int done = 0;
          workAnswer = answer;
          
          if (!done && workAnswer % 10 == workGuess % 10 && a2 == 0) {
            ++white;
            a2 = 1;
            done = 1;
          }
          workAnswer /= 10;
          if (!done && workAnswer % 10 == workGuess % 10 && a3 == 0) {
            ++white;
            a3 = 1;
            done = 1;
          }
          workAnswer /= 10;
          if (!done && workAnswer % 10 == workGuess % 10 && a4 == 0) {
            ++white;
            a4 = 1;
            done = 1;
          }
        }
    
       
        workGuess /= 10;
        if (g2 == 0) {
          int done = 0;
          workAnswer = answer;
          if (!done && workAnswer % 10 == workGuess % 10 && a1 == 0) {
            ++white;
            a1 = 1;
            done = 1;
          }
          workAnswer /= 10;
          workAnswer /= 10; /* skip digit 2 */
          if (!done && workAnswer % 10 == workGuess % 10 && a3 == 0) {
            ++white;
            a3 = 1;
            done = 1;
          }
          workAnswer /= 10;
          if (!done && workAnswer % 10 == workGuess % 10 && a4 == 0) {
            ++white;
            a4 = 1;
            done = 1;
          }
        }
    
       
        workGuess /= 10;
        if (g3 == 0) {
          int done = 0;
          workAnswer = answer;
          if (!done && workAnswer % 10 == workGuess % 10 && a1 == 0) {
            ++white;
            a1 = 1;
            done = 1;
          }
          workAnswer /= 10;
          if (!done && workAnswer % 10 == workGuess % 10 && a2 == 0) {
            ++white;
            a2 = 1;
            done = 1;
          }
          workAnswer /= 10;
          workAnswer /= 10; /* skip digit 3 */
          if (!done && workAnswer % 10 == workGuess % 10 && a4 == 0) {
            ++white;
            a4 = 1;
            done = 1;
          }
        }
    
        
        workGuess /= 10;
        if (g4 == 0) {
          int done = 0;
          workAnswer = answer;
          if (!done && workAnswer % 10 == workGuess % 10 && a1 == 0) {
            ++white;
            a1 = 1;
            done = 1;
          }
          workAnswer /= 10;
          if (!done && workAnswer % 10 == workGuess % 10 && a2 == 0) {
            ++white;
            a2 = 1;
            done = 1;
          }
          workAnswer /= 10;
          if (!done && workAnswer % 10 == workGuess % 10 && a3 == 0) {
            ++white;
            a3 = 1;
            done = 1;
          }
          no need to check digit
        }
        printf("Black: %d  White: %d\n", black, white);
      }
      printf("The answer is %d\n", answer);
    
      return 0;
    }
    Last edited by wtxwt; 10-24-2007 at 10:01 AM.

  5. #35
    and the hat of int overfl Salem's Avatar
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    Well that is until they used fflush(stdin), then it all went horrible again.

    > no need to check digit
    What is this half a dozen lines from the end?
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  6. #36
    Frequently Quite Prolix dwks's Avatar
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    You can't use arrays or pointers, but can you use functions? Because it would make the code a lot simpler if you can and do. (At the risk of repeating matsp's words.)
    dwk

    Seek and ye shall find. quaere et invenies.

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  7. #37
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    Quote Originally Posted by wtxwt View Post
    Yes, this is what I want.
    Here is the source of my program, how to improve it?
    I don't want to use so many "if else" statement

    Another problem is that the program calculate the near match wrongly when repeated numbers appear, how to solve it?

    Code:
    #include<stdio.h>
    #include<time.h>
    
    main()
    {
    	srand(time(NULL));
    	int c1 = rand() %9 + 1,
    		c2 = rand() %9 + 1,
    		c3 = rand() %9 + 1,
    		c4 = rand() %9 + 1,
    		g1, g2, g3, g4,turn,exact,near;
    	//printf("Answer is: %d %d %d %d\n",c1,c2,c3,c4);
    	exact = 0;
    	near = 0;
    	for (turn = 1; turn <= 10; turn++)
    	{		
    		printf("Turn %d\n",turn);
    		printf("Please enter your guess (e.g. 1 3 3 4):\n");
    		scanf("%d %d %d %d",&g1,&g2,&g3,&g4);
    		
    		if (g1==c1)
    		exact++;
    		else if (g1==c2||g1==c3||g1==c4)
    		near++;
    		
    		if (g2==c2)
    		exact++;
    		else if (g2==c1||g2==c3||g2==c4)
    		near++;
    		
    		if (g3==c3)
    		exact++;
    		else if (g3==c1||g3==c2||g3==c4)
    		near++;
    		
    		if (g4==c4)
    		exact++;
    		else if (g4==c1||g4==c2||g4==c3)
    		near++;
    		
    		printf("Number of Exact Match: %d\n",exact);
    		printf("Number of Near Match: %d\n\n",near);
    		
    		if (exact==4)
    		{printf("You break the code by trying %d time(s)\n",turn);
    		printf("Game Over!");
    		turn = 10;}
    		else
    		{exact = 0;
    		near = 0;}
    		
    		if (turn==10 && exact!=4)
    		{printf("You fail to break the code!\n");
    		printf("Game Over!");
    		printf("\nAnswer is: %d %d %d %d\n",c1,c2,c3,c4);}
    	}	
    }
    How if wanna do this by using array? Currently my assignment same urs but need do it with array. Google through the web and still duno wat to do ...

  8. #38
    Deathray Engineer MacGyver's Avatar
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    Next time, you should probably start a new topic and just link to the old one instead of bumping an older topic.

    If you understand how Mastermind works, and you have a decent idea of how the I/O of the game should work, then this should be non-trivial.

    Show us what you have thus far and where you're stuck. If you just want to know where to start, start here:

    Code:
    #include <stdio.h>
    
    int main(void)
    {
    	/* Put your code here */
    	return 0;
    }

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