Question

I’m having trouble changing the line fwrite(tmp_array, sizeof(int), num, f); to fprintf.

Can someone please take a look for me?

 void generate_random_sorted_file(const char *file_name, int num)
 {
     FILE *f = fopen(file_name, "wb");
     if (f==NULL) 
     {
         printf("could not open %s\n", file_name);
         return;
     }

     int *tmp_array = calloc(num, sizeof(int));
     int i;

     for (i=0; i<num; i++)
     tmp_array[i]=rand();

     qsort (tmp_array, num, sizeof(int), compare); /* sorts the array */
     fwrite(tmp_array, sizeof(int), num, f);

     fclose(f);
 }

Answer 1

fprintf will write the your integer array as text, if that’s what you want, do something like

int i;
for(i = 0; i < num; i++)
  fprintf(f,"%d ",tmp_array[i]);