期末考預告-2

// ConsoleApplication1.cpp : 定義主控台應用程式的進入點。
//

#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <string>
using namespace std;

void main()
{
    ifstream data;
    data.open("C:\\log.txt", ios::in);
    if (!data)
    {
        cout << "Open fail\n";
    }
    string n;
    int counter=0;
    while (!data.eof())
    {
        data >> n;
        for (int i = 0; i < n.length(); i++)
        {
            if (n[i] == '3')
                counter++;
        }
    }
    cout << counter << endl;
}