Thread: Problems with Malloc

I'm trying to use malloc to increase the size of 3 dynamic arrays, but it keeps crashing as soon as it enters the first for loop. count is a pointer to an int holding the total nomber of records there should be, fname and lname are dynamic arrays holding names equal to count, and grades is another dynamic array holding the grades.

Code:

 void addRecs(int *count, char **fname, char **lname, float *grades)
{

  *count = *count + 1;

  //reallocate older stuff
  char **tempf = realloc(fname, *count * sizeof *tempf);
  for (int i = 0; i < *count - 1; i++) {
    tempf = realloc(fname, 20 * sizeof *tempf);
  }

  char **templ = realloc(lname, *count * sizeof *templ);
  for (int i = 0; i < *count - 1; i++) {
    templ = realloc(lname, 20 * sizeof *templ);
  }
  float *tempg = realloc(grades, *count * sizeof *tempg);

  //allocate space for newest
  templ[*count - 1] = (char *) malloc(20 * sizeof *lname[*count - 1]);
  tempf[*count - 1] = (char *) malloc(20 * sizeof *fname[*count - 1]);

  free(fname);
  free(lname);
  free(grades);

  fname = tempf;
  lname = templ;
  grades = tempg;

  printf("Add a record\n");
  scanf("%s %s %f", &fname[*count - 1][0], &lname[*count - 1][0],
        &grades[*count - 1]);
  int i;
  for (i = 0; i < *count; i++) {
    printf("First Name: %s, Last Name: %s, Score: %.2f \n", &fname[0],
           &lname[0], grades);
  }
}