Question

I want to implement bubble sort with writing to the file. I think that sorting is implemet good, but something wrong is with writing to file.

int main(int argc, char *argv[])
{
   FILE *fp; 
   int tab[] = {3,5,1,2,4};
   int i, j, temp;
   if ((fp=fopen("test.txt", "w"))==NULL) {
     printf ("Error!\n");
     exit(1);
   }
   for(i =0; i<5;i++)
   {
     for(j=0; j<4; j++)
     {
       if(tab[j] > tab[j+1])
       {
         temp = tab[j+1];   
         tab[j+1] = tab[j]; 
         tab[j] = temp;
       }
     }
   }

   fprintf (fp, "%d", tab);
   fclose (fp); 
   return 0;
}

Can you help me?

Answer 1

Since %d format string instructs printf() to print a single integer what the code tries to do is writing a pointer to an array of integers as if it was an integer.

Simply loop over your array and print one int in every iteration. You will also need to decide on a separator you want to use or else all the integers will be written side by side preventing the reader from making sense of them.