#include <stdio.h>

main() {

  int rc;
  int curr_year, birth_year, age;
  char fi, li, temp;
  float ftemp, ctemp;

  curr_year = 2003;

  printf("Please enter your first and last initials: ");
  rc = scanf("%c%c", &fi, &li);
  if (!isalpha(fi) || !isalpha(li) || !isupper(fi) || !isupper(li)) {
    printf("Must use upper case letters for first and last initials\n");
    exit(1);
  }

  printf("Please enter your birth year: ");
  scanf("%d", &birth_year);
  if ((birth_year >= curr_year) || (birth_year < 0)) {
    printf("Must have been born previous to the current year and after year -1\n");
    exit(1);
  }

  printf("Please enter your current body temp (in fahrenheit): ");
  scanf("%f", &ftemp);
  if (ftemp < 0) {
    printf("Body temp must be positive\n");
    exit(1);
  }

  ctemp = (5*(ftemp - 32))/9;
  age = curr_year - birth_year;

  printf("Well, %c.%c., it seems as though you are now age %d. And in case you were wondering, your body temp, in celsius, is %f.\n", fi, li, age, ctemp);

}