arrays in function prototypes

This is a discussion on arrays in function prototypes within the C++ Programming forums, part of the General Programming Boards category; ok, relatively simple. I am declaring a function prototype, and I am trying to pass a 2-dimensional array. my error ...

  1. #1
    Registered User sentienttoaster's Avatar
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    arrays in function prototypes

    ok, relatively simple. I am declaring a function prototype, and I am trying to pass a 2-dimensional array. my error says "too few arguments to function 'int bsize(char (*) [16], int)' my actual code says "int bsize (char board[][16], int tile). Exactly how do I fix this?
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  2. #2
    Toaster Zach L.'s Avatar
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    Where do you call it? That is where the problem will be.

    When you pass an array, it is the same as passing a pointer (to the first element of the array), so the error message is consistent with your code.
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    I declare it before my int main()
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  4. #4
    Toaster Zach L.'s Avatar
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    Where's the actual function call though (seeing code would help).

    My guess is the problem is something like this:
    Code:
    int bsize(char [][16], int);
    ...
    int main( )
    {
      char** str = ...;
      int z = bsize(str); // Note the missing parameter.. i.e. "Too few arguments to bsize(char (*)[16], int)"
    }
    The word rap as it applies to music is the result of a peculiar phonological rule which has stripped the word of its initial voiceless velar stop.

  5. #5
    Guest Sebastiani's Avatar
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    *how* are you calling the function? It should be something like:

    Code:
    void foo(char m[][10]){}
    
    int main()
    {
     char x[10][10];
     foo(x);
    }
    Code:
    bool fun(bool value)
    {
        return std::pow(std::exp(1), std::complex<float>(0, 1) 
        * std::complex<float>(std::atan(1)*(1 << (value + 2))))
        .real() > 0;
    }

  6. #6
    Registered User sentienttoaster's Avatar
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    Code:
    #include<iostream>
    #include<ctime>
    using namespace std;
    
    int bsize(char board[][16], int tile);
    int config(char board[][16], int tile);
    bool attack(char board[][16], int tile);
    void print(char board[][16], int tile);
    
    int main()         //need function to test for attacking queen, and to print
    {                  //out config
      srand(time(0));
      bsize();
      config(char board[][16], int tile);
      print(char board[][16], int tile);
    
      return 0;
    }
    
    
    int bsize()
    {
      int tile;
      char board[][16];
      cout<<"Please input a number. This number will\nrepersent the number of rows and columns.\nEx. inputting 3 means three rows AND three columns.";
      cin>>tile;
      return (board[][16], tile);
    }
    
    int config(char board[][16], int tile)
    {
      int queen, random, row=1, column=1;
      do
        {  
          do
    	{
    	  random=rand()%tile+1;
    	  board[row][random]='Q';
    	  row++;
    	}while(row<=tile);
          do
    	{
    	  random=rand()%tile+1;
    	  board[random][column]='Q';
    	  column++;
    	}while(column<=tile);
        }while(attack()=0);
      return (board[][16], tile);
    }
    bool attack(char board[][16], int tile)
    {
      int a=(-1), b=(-1), c=(-1), d=0, e=0, f=0, g=0, h=0, i=0, j=0;
      bool attack;
      do
        {
          if(board[i+a][j+b] && board[i+c][j+d])
    	{
    	  attack=1;
    	}
          e++;
          f++;
          if(e<=3)d++;
          if(e<=6 && e>=4)
    	{
    	  c++;
    	  if(f==3)
    	    {
    	      d=(-1);
    	      h++;
    	    }
    	}
          if(e<=9 && e>=7)
    	{
    	  b++;
    	  if(h==3)
    	    {
    	      c=(-1);
    	      g++;
    	    }
    	}
          if(e<=12 && e>=10)
    	{
    	  a++;
    	}
        }while(attack==0);
      return attack;
    }
    void print(char board[][16], int tile)
    {
      int alpha=0, omega=0, count=0, line=0;
      do
        {
          cout<<board[alpha][omega];
          line++;
          if(line==tile)cout<<endl;
          alpha++;
          if(alpha==tile)
    	{
    	  omega++;
    	  alpha=0;
    	}
        }while(omega<tile);
    }
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  7. #7
    Toaster Zach L.'s Avatar
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    Take a look at the function's signature in the declaration, and then its signature in the definition. The problem should readily present itself.
    The word rap as it applies to music is the result of a peculiar phonological rule which has stripped the word of its initial voiceless velar stop.

  8. #8
    Registered User sentienttoaster's Avatar
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    too me it looks like it's right. shouldn't it be the same in both??? if not coreect me. I've been working for a long time, and I may not be thinking correctly.
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  9. #9
    Toaster Zach L.'s Avatar
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    Hang on... I didn't look closely enough to notice some other errors. Your two declarations should be the arguments. Also, you can only return one value. You can pass those parameters by reference and modify them, or you can return a structure containing a char** and an int, but you can only return one thing from the function (and it expects that thing to be an int).
    The word rap as it applies to music is the result of a peculiar phonological rule which has stripped the word of its initial voiceless velar stop.

  10. #10
    Registered User sentienttoaster's Avatar
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    if I pass by reference, would that fix it. I only ask because I've seen other code that passes more than one arguement.
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  11. #11
    Toaster Zach L.'s Avatar
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    The main problem I'm seeing is this:
    Code:
    int bsize(char board[][16], int tile);
    //... Later on ...
    int bsize( )
    {
      ...
    }
    You are correct that they should be the same.

    It actually appears that you don't need anything in your parameter list for this function. It never modifies its arguments, or otherwise uses them. It just needs to return its value that it got from the user.

    Also, neither board nor tile have are in scope in main. You need to define them before you pass them to functions.

    i.e.
    Code:
    int main( )         //need function to test for attacking queen, and to print
    {                  //out config
      srand(time(0));
      int tile = bsize( );
      char board[16][16] = { ... };
      config(board, tile);
      print(board, tile);
    
      return 0;
    }
    The word rap as it applies to music is the result of a peculiar phonological rule which has stripped the word of its initial voiceless velar stop.

  12. #12
    Registered User sentienttoaster's Avatar
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    in my situation I'm not allowed to use global variables. I'm trying your corrections now.
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  13. #13
    Registered User sentienttoaster's Avatar
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    ok, I am still recieving that error in each instance of the array.
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  14. #14
    Guest Sebastiani's Avatar
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    >> char board[][16];

    You can't declare an array like that. The compiler has no way of knowing how big to make the array.

    >> print(char board[][16], int tile);

    You don't invoke a function in the same way you declared it.

    Look at my previous post. That's basically how you declare an array and pass it to a function.


    >> int bsize(char board[][16], int tile);

    >> bsize();

    The function prototype takes two arguments. The definition and call take none. Which is it?

    Ditto for attack().

    >> return (board[][16], tile);

    What in the world are you doing here?

    >> bool attack;

    You need to initialize variables when necessary. Looking at the loop, I'd say it's necessary here.

    There could be some more errors in there. Those were just the most obvious.
    Code:
    bool fun(bool value)
    {
        return std::pow(std::exp(1), std::complex<float>(0, 1) 
        * std::complex<float>(std::atan(1)*(1 << (value + 2))))
        .real() > 0;
    }

  15. #15
    Toaster Zach L.'s Avatar
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    *edit: What he said ^.

    In the code I posted, they aren't global. They are function scope for main. They actually have to be outside any function to be global.

    What it seems is that you only want one instance of the board (array), and then pass it around to the other functions as necessary.

    bsize ought to look something like this at this point:
    Code:
    int bsize()
    {
      int tile;
      cout << ...;
      cin >> tile;
      return tile;
    }
    The word rap as it applies to music is the result of a peculiar phonological rule which has stripped the word of its initial voiceless velar stop.

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