search of symbols

#include <iostream>
#include <sstream>
#include <fstream>

using namespace std;

int Str_check(string Stroka, string Need) {
    string word;
    stringstream x;

    x << Stroka;
    int i = 0;
    while (x >> word) {
        if (word == Need) {
            i++;
        }
    }
    return i;
}

int main() {
    setlocale(0, "rus");

    int i = 0;
    fstream f("file.txt");
    string need, stroka;
    char symbol;
    bool s = false;

    cout << "Введите символ/слово: \n -> ";
    cin >> need;

    if (need.length() == 1) {
        symbol = need[0];
        s = true;
    }


    if (s) {
        char ch;
        while (!f.eof()) {
            ch = f.get();
            if (ch == symbol)
                i++;
        }
    }
    else {
        while (1) {
            getline(f, stroka);
            i = i + Str_check(stroka, need);
            if (f.eof())
                break;
        }
    }
    f.close();
    cout << i << endl;

    system("pause");
    return 0;
}