passing array of integer to void function which modifies it

This is a discussion on passing array of integer to void function which modifies it within the C Programming forums, part of the General Programming Boards category; Hi, I'm trying to write a minesweeper C code, this is how I started. I sadly can't figure out how ...

  1. #1
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    Dec 2011
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    1

    passing array of integer to void function which modifies it

    Hi, I'm trying to write a minesweeper C code, this is how I started. I sadly can't figure out how to pass the field array to the create_field function. I've tried pointers,&,void brackets,no brackets,one void bracket and one with a dimension,and more, but the compiler returns lots of errors, such as this thing is neither a pointer nor an array nor an integer, or segmentation fault, or expected declaration before some input or bracket...I honestly can't see the error, thanks in advance!
    P.S. I first created the field directly in the main() and then it worked.In order to make the program more elegant to see, or at least the main() more concise, I tried to subdivide it in several functions, of which this is the second, and the first problematic.
    Code:
    #include<stdio.h>
    #include<time.h>
    #include<stdlib.h>
    main() {
    int A,B,mines; // rows and columns and number of mines
    askNumbers(&A,&B,&mines);
    
    int field[A][B];
    create_field(A,B,mines, FIELD????); // how is this to be written?
    
    ...
    
    }
    
    void create_field(P,Q,mines,FIELD??) { // same question
      int i,j;
      srand(time(NULL));
      for (i=0; i<P; i++)
        for (j=0; j<Q; j++)
          field[i][j] = 0; // unmined field
    
      do {
        for (i=0; i<P; i++)
          for (j=0; j<Q; j++)
        if (0==rand() && mines && 9!=field[i][j]) {
          field[i][j] = 9; // puts mines
          mines--;
        }
      } while (mines);
    }

  2. #2
    Registered User
    Join Date
    Sep 2006
    Posts
    8,868
    You need to declare your array in main(), then you pass it around to all the other functions. Every array and other variables in C is case sensitive, so watch your capitalization.

    An example:

    Code:
    #include <stdio.h>
    
    #define MAX 4
    
    void status(int swapped[MAX][MAX]);
    
    int main(void) {
    
       int swapped[MAX][MAX]={{1,2,3,4},{5,6,7,8},{9,10,11,12},{13,14,15,16}};
       //other code in here
       //try and work out what the call to the status function, would be, OK
     
       return 0
    }
    void status(int swapped[MAX][MAX]) {
       int i, j;
          
       //swap status:
       for(i=0;i<MAX;i++) {
          printf("person: %2d: ",i);
          for(j=0;j<MAX;j++)
             printf(" %2d ",swapped[i][j]);
          printf("\n");
       }
    }
    Last edited by Adak; 12-23-2011 at 05:02 PM.

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