Writing to a file

[Toph]

Im currently writing a programme which involves reading from a
txt file full of 1 0 1 0 0 0 binary code in a 100x100 table. I can
read the file and apply the values to the matrix array and update
it like i need to but when i write it back into the file it doesnt put
in any of the 0's.
Obviously this is a big problem!

I think this is all the useful code:

in = fopen ( "matrix100x100.txt", "w" );
   if ( in == NULL ) 
   {
    printf ( "File open failure" );
   }
   fprintf ( in, "%d", matrix[r][c]);                
   fclose (in);    //closes file//

can anyone tell me what im doing wrong please?
I had thought of using %c or %f but i wasnt sure if
that would allow me to add the values like i need
to for bits.

is fprintf the best way to do this?

Basically...Please help!

Thanks.

[Prelude]

>I think this is all the useful code
Hmm. Try again, this time with code that we can compile and run immediately and the contents of the file so that we can play with it.

[Toph]

Well the full thing is this

#include <stdio.h>
#include <clib.h>
#include <stdlib.h>

int main(void)
{
  char repeat;
  int matrix[100][100],r,c,total;
  do
  {
  FILE *game;   
  printf("************************************\n*    Welcome to the Game of Life.  *\n************************************\n");
  if((game=fopen("matrix100x100.txt", "r")) != NULL)  //finds and reads matrix file//


        {

        printf ("File open\n\n");

        for ( r = 0 ; r < 100 ; r++ )    //controls rows//
                {
                for ( c = 0 ; c < 100 ; c++ )  //controls columns//
                        {
                        fscanf( game, "%d", &matrix[r][c] );//put values into Matrix from file//
                        printf(" %d", matrix[r][c]);       //print current Matrix Values//
                           
                        }
                        printf("\n"); //Give a new line at each row//
                }
         }
   else printf ("File could not be opened\n");

   printf ("\nThis is the Original Generation\n\nPress a Key to create Second Generation\n");
   getch();       //Stops programme until user inputs a value//
   system("cls"); //Clears Screen//
   printf("************************************\n*    Welcome to the Game of Life.  *\n************************************\n");
   printf ("Updating Matrix\n\n");
   for (r = 0 ; r < 100 ; r++ )    //increments rows//
                {
                for ( c = 0 ; c < 100 ; c++ )  //increments Columns//
                        { 
                         total = matrix[r-1][c-1]+matrix[r][c-1]+matrix[r+1][c-1]
                         +matrix[r-1][c]+matrix[r+1][c]+matrix[r-1][c+1]+matrix[r][c+1]
                         +matrix[r+1][c+1];  //sums neighbouring cells//
                         if (matrix[r][c]==0 && total==3 || matrix[r][c]==1 && total==2 || matrix[r][c]==1 && total==3)
                         {
                         matrix[r][c]=1; //sets value to alive if fitting rules//
                         }
                         else if (matrix[r][c]==1 && total>3 || matrix[r][c]==1 && total<2)
                                {
                                 matrix[r][c]=0; //sets value to dead if fitting rules//
                                }
                         printf(" %d", matrix[r][c]);  //prints new matrix values//     
                        }
                        printf("\n");
                }             
   game = fopen ( "matrix100x100.txt", "w" );
   if ( game == NULL ) 
   {
    printf ( "File open failure" );
   }
   fprintf ( game, "%d", matrix[r][c]);                
   fclose (game);    //closes file//
   printf ("\nDo you want to run it again? Y/N\n");    //option to re-run programme//
   repeat=getch();
   system ("cls"); //Clears Screen//
   }
   while (repeat=='y');     //if user types 'y', programme repeats//
   }

And ive attatched the txt file. didnt want to bung everything up with too much code, but there you go!
Thanks

[Salem]

Are you guys in the same class?

[Toph]

we are friends, yes. I hope that wont be a problem.

I dont really see why it should matter, we are both here
asking for help on different aspects of c programming,
which is what the board is for, and its not like im asking
anyone to write code for me, just let me know what
ive done wrong and if theres something i can do about
it.

Once again, thank you for your help.

[swoopy]

> fprintf ( game, "%d", matrix[r][c]);

This just prints one value to the file. A loop might help.

[Toph]

THANK YOU SWOOPY!!!!!!
Thats sorted it all now. I cant believe i didnt notice that!
The programme now works perfectly so i am a very happy bunny!
Thanks again & God Bless you!