c++ - 无法访问对象 vector 中的成员函数

Question

我试图简单地创建一个对象 vector ，向其中添加一个对象，然后通过访问函数“getter's”在 vector 中显示该对象中的一些变量。代码可以编译，但对于返回字符串的函数和返回 double 的函数，它没有显示任何内容。我相信这很简单……你能帮忙吗(几个小时后交作业 :S)？

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

class Employee
{
    string fName, lName;
    double weeklyIncome, grossSales, bonus;
public:
    Employee(){};
    Employee(string fn, string ln, double sales)
    {
        fName = fn;
        lName = ln;
        grossSales = sales;
        bonus = sales * 0.09;
        weeklyIncome = 200;
    }
    double getNetIncome() {return bonus + weeklyIncome;}
    string getfName() {return fName;}
    double getgrossSales() {return grossSales;}
    ~Employee(){};
};

int main()
{
    vector<Employee> salespeople(15);
    Employee e1("John", "Smith", 5000);
    salespeople.push_back(e1);
    cout << salespeople[0].getNetIncome();
    cout << salespeople[0].getgrossSales();
    cout << salespeople[0].getfName();
    system("pause");
    return 0;
}

Answer 1

vector<Employee> salespeople(15);      // This creates a vector of 15 elements
Employee e1("John", "Smith", 5000);
salespeople.push_back(e1);             // Now you have added the 16-th element
cout << salespeople[0].getNetIncome(); // The first element is still the default
                                       // constructed element.
cout << salespeople[0].getgrossSales();
cout << salespeople[0].getfName();

您可以通过使用来解决问题

vector<Employee> salespeople;  // Create an empty vector and then
                               // add items to it.

或通过改变

salespeople.push_back(e1);

到

salespeople[0] = e1;

改进建议

更改默认构造函数以将 double 变量初始化为正常值。

Employee() : weeklyIncome(0.0), grossSales(0.0) bonus(0.0) {};