/* This program counts the number of characters,
   letters, digits, and lines in textfile.txt */
   
#include <stdio.h>

int main (void) {
   FILE *infile;
   char ch;
   int characters=0, letters=0;
   int digits=0, others=0;
   int status;

   infile = fopen("textfile.txt", "r");  
   if (infile == NULL)
     printf("Cannot open textfile.txt\n");
     
   status = fscanf(infile, "%c", &ch); 
   while (status != EOF) {
      characters++;
      if ((ch>='A' && ch<='Z') || (ch>='a' && ch<='z'))
        letters++;
      else if (ch>='0' && ch<='9')
        digits++;
      else
        others++;
      status = fscanf(infile, "%c", &ch);
   }

   printf("Characters = %d\nLetters = %d\n", characters, letters);
   printf("Digits = %d\nOthers = %d\n", digits, others);
   fclose(infile);
      
   return 0;
}