C++ 和文件输出

Question

我正在尝试做一个 C++ 程序，它做这样的事情:在一个姓氏和名字的列表(文件)中，读取相同的姓氏并在另一个文件中盖章 'people with surname surname are: name,name、姓名 等..这就是我所做的，但出了点问题

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

using namespace std;

struct persona
{
    string nome;
    string cognome;
};

int carica_vettore (persona a [])
{
    string name, surname;
    int i=0, np=0;
    ifstream fin ("people.txt");
    while (cin >> name >> surname) 
    {
        if (name == "0" && surname == "0")
            break;

        a[i].nome = name;
        a[i].cognome = surname;
        i++;
        np++;
    }
    return np;

}

int main ()
{
    string nomepers, cognomepers;
    int cont = 0;
    persona persone [50];
    cont = carica_vettore(persone);
    for (int k = 0; k < cont; k++)
    {
        for (int j = k+1; j < cont-1; j++)
            if (persone[k] == persone[j])
                cout << "People with surname (" << persone[i] << "), are: " << persone[i].nome;
    }   
    return 0;
}

还有我忘记在文件上盖章了，但我认为这不是什么大问题

那么，有人可以帮助我吗？

2 'for' 谁检查是否有任何相同的姓氏 btw

Answer 1

你不是要从文件中读取吗？

ifstream fin("people.txt");
while(cin >> name >> surname) // cin reads from the console, waits for your input

替换cin与 fin .

你也没有operator==对于 persona重载:

bool operator==(persona const& other) const
{
    return nome == other.nome && cognome == other.cognome;
}

还有operator<< ，这里是必需的:

cout << "People with surname (" << persone[i] << ...

打印 persone[i].nome或 persone[i].cognome相反。