Question

我正在研究这个项目，我无法弄清楚如何将所有信息输出到文本文件中，它似乎只输出输入的最后一点信息。在平均输出之前输入新标题之前，我只能设法让它将平均值放在文本文件中。请帮帮我！

#include <iostream>
#include <fstream>
#include <vector>
#include <string>
using namespace std;

class FamilyMember
{
    private:
        int age;
        string name;

    public:

        FamilyMember();
        ~FamilyMember(){}

    void setName(string memberName)
    {name = memberName;}
    void setAge(int memberName)
    {age = memberName;}
    int getAge()
    {return age;}
    string getName()
    {return name;}
    void printFamilyMemberInfo();
};

FamilyMember::FamilyMember()
{
    age = 0;
}

void FamilyMember::printFamilyMemberInfo()
{
    ofstream dataFile;

    dataFile.open("myFamily.txt", ios::out);

    dataFile << name << endl;

    dataFile << age << endl;

}

int main()
{

    vector<FamilyMember> list;
    string Name;
    int Age, x, n;

    fstream dataFile;

    FamilyMember *c;

    cout << "Input number of family members";

    cin >> x;

    for(n = 0; n < x; n++)
    {
        cout << "Enter name:";
        cout << endl;
        cin >> Name;
        cout << "Enter age:";
        cout << endl;
        cin >> Age;

        c = new FamilyMember;
        c->setName(Name);
        c->setAge(Age);
        list.push_back(*c);
    }


    vector<FamilyMember>::iterator v;

    for(v = list.begin(); v != list.end(); ++v){

        v->printFamilyMemberInfo();
    }

    double a, b;

    for(n = 0; n < x; n++)
    {
        a += list.at(n).getAge();
    }

    b = a / x;

    std::ofstream datafile("myFamily.text", std::ios_base::out |                 std::ios_base::app);

    dataFile << "Average age is: " << b << endl;

    return 0;

}

Answer 1

尝试在追加模式下打开流而不是ios::out

void FamilyMember::printFamilyMemberInfo()
{
    ofstream dataFile;

    dataFile.open("myFamily.txt", ios::app); // OPEN IN APPEND MODE

    dataFile << name << endl;

    dataFile << age << endl;

}

我无法弄清楚如何正确地输出所有信息到文本文件

1 个答案: