FILE

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <fstream>
#include <string>
#include <string.h>

using namespace std;

#define MAX 100
#define MAXLENGTH 10

struct TU
{
    char noidung[MAXLENGTH];
    int dem;
};

TU danhsach[MAX];
int spt = 0;

int main()
{
    char temp[MAXLENGTH];
    int timthay;
    ifstream f("DATA.IN"); //ifstream : Ho Tro doc tu file
    while (!f.eof())
    {
        f >> temp;
        timthay = 0;
        strcpy_s(temp, _strlwr(temp));
        for (int i = 0; i < spt; i++)
        {
            if (strcmp(danhsach[i].noidung, temp) == 0)
            {
                timthay = 1;
                danhsach[i].dem++;
                break;
            }
        }
        if (!timthay)
        {
            strcpy(danhsach[spt].noidung, temp);
            danhsach[spt].dem = 1;
            spt++;
        }
    }
    ofstream f_out("KETQUA.OUT"); //OFSTREAM : Ho tru xuat file
    for (int i = 0; i < spt; i++)
    {
        f_out << danhsach[i].noidung << " " << danhsach[i].dem << endl;
    }
    return 0;
}