// 3.cpp: 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include<iostream>
#include<string>
#include<cstring>
#include<vector>
#include<array>
#include<ctime>
#include<fstream>
#include<cstdlib>
#include<cctype>
using namespace std;
const int strsize = 20;
struct intribute
{
    string name;
    double money;
};
int main()
{
    char ch;
    int count = 0;
    ifstream inFile;
    inFile.open("name.txt");
    while (inFile.good())
    {        

        inFile >> ch;        
        if (isalpha(ch))
            count++;

    }
    cout << count << endl;
    return 0;
}

name.txt
abcde