you made create the future!!!

/* 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("\nNhap vao mot chuoi bat ky : ");
gets(chuoi);

while (chuoi != 0)
{
if (isalpha(chuoi[i++]))
count++;
}

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