occorrenze di una stringa in una linea di un file

main.cpp

#include <fstream>
#include <iostream>
#include <string>


int main() {
    std::ifstream in_file{"dati.txt"};
    std::string line,search_string;

    std::cout << "Inserisci stringa da cercare> ";
    std::cin >> search_string;


    //in_file >> line;
    std::getline(in_file,line);


    bool found = false;
    for (int i  = 0; i< line.size();i++) {
        auto s = line.substr(i,search_string.size());
        if (s == search_string) {
            found = true;
        }
    }

    if (found) {
        std::cout << "trovata!\n";
    } else {
        std::cout << "non trovata\n";
    }

    // contare quante volte si trova la
    // sottostringa

    int occorrenze = 0;
    for (int i  = 0; i< line.size();i++) {
        auto s = line.substr(i,search_string.size());
        if (s == search_string) {
            occorrenze++;
        }
    }

    
    return 0;
}