Go4Expert - randomize chars in multi dimen array

Hi guys im making a minesweeper game. "Result" variable is equal to the NoMines, basically
i need to randomize the NoMines in the mineField multi dimensional array and then print the
'M' in the random positions in the array some in columns some in rows but randomly. Iv done something like this but im not sure how correct it is?

size is the whole size of the mineField if user types 3 the grid is the square root of it
printf grid mine size prints '?' depending on how large the size of the grid is
? ? ?
? ? ?

this is how i need to random the character in the array
? ? M
? M ?

i need to be able to print them in squares not sure how too?

Code:



define MINE 'M'



void printGridMineSize(char displayGrid[MAX_GRID][MAX_GRID],unsigned size,int getMineSize)

{

    

    /* declaration of for loop variables*/

    int i=0;

    int k=0;

    int j=0;

    int a=0;

    int b=0;

  

    printf("************************** Mine Sweeper**************************\n");

    printf("\n");

   

    /* outter loop for array*/

    

    for(i=0; i<size; i++)

    {

         /* loop to keep printing inside seperator lines*/

         for(b=2; b<=size; b++)

         {

           printf("+---");

           

         }

         printf("+---\n");

         

         printf("|");

         

         /* printing columns and also the array*/

         for(a=0; a<size; a++)

         {

                

                printf(" %c |",displayGrid[i][k]); 

                

                

         }

         printf("\n");

         

    } 

         /* print the outter seperators*/

         for(j=0;j<size; j++)

         {

         

                printf("+---"); 

         

         

         

         }

         printf("\n");

        

        

        

    

    

}









void placeMines(char minefield[MAX_GRID][MAX_GRID], unsigned size)

{



  double result;

  double sizetotal;

  double roundUp;

  int seed;

  int range;

  int NoMines;

  int TotalMine;

  int i=0;

  int j=0;

  char mineChar = MINE;

  

  rand()%range;

  /* square root the grid number*/

  

  sizetotal = size * size; 

  

  /* result is the sizetotal * 0.6*/

  result = (float)(float)sizetotal * MINE_DENSITY;

  

  /*rouding the number up 5.7 up to 6*/

  roundUp = ceil(result);

  

  /* cast it to an int to get no decimal places*/

  printf("%d",(int) roundUp);

  

  roundUp = NoMines;

  

  

  /* for the size thats entered randomize the mines in the array and print them in the squares*/

  for(i=1; i<size; i++)

  {

     printf("%c\n",mineChar);

     minefield[i][j]=rand();

     

     

     printf("\n");

  }

  



}