/* Bai tap 9_1 - Dem so lan xuat hien cac ky tu trong chuoi */

#include <stdio.h>

#include <ctype.h>

void main()

{

  char chuoi[80];

  int i = 0, count = 0;

  printf("

Nhap vao mot chuoi bat ky : ");

  gets(chuoi);

  while (chuoi[i] != 0)

  {

    if (isalpha(chuoi[i++]))

      count++;

  }

  printf("So ky tu trong chuoi = %d", count);

  getch();

}