AlphabetCount

#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
int *count(FILE *in) {
  int i, c;
  int *counter = (int *) malloc(26 * sizeof(int));
  for (i = 0; i < 26; i++) counter[i] = 0;
  while ((c = fgetc(in)) != EOF) {
    if (isupper(c)) {
      counter[c - 'A']++;
      continue;
    }
    if (islower(c)) {
      counter[c - 'a']++;
      continue;
    }
  }
  return counter;
}
int main(int argc, char **argv) {
  FILE *in = fopen(argv[1], "r");
  int *counter = count(in);
  fclose(in);
  int i;
  for (i = 0; i < 26; i++) printf("%c %d\n", i + 'A', counter[i]);
  free(counter);
  return 0;
}