每行读取一个对象的C ++文件行不同的数据类型

Question

所以我试图通过从输入文件中获取信息来在C ++中创建一个对象数组（Item对象）。第一行包含物品的数量以及存储它们的行李的总容量。之后的每一行都包含一个项目的名称，利润和中间有空格的权重。

输入文件示例：

7 25
orange 50 5
banana 60 10
kitchensink 140 20
strawberry 100 14
tangerine 10 5
puppy 25 12
grape 30 7

如何设置我的程序/构造函数，使其不只读取第一行并逐行读取项目？

#include <iostream>
#include <fstream>
#include <cstring>
#include <queue>
using namespace std;

static ifstream fr;
//class for item object
class Item
{
public:
    //constructor that will get/initialize the name, weight, 
    //profit of item from input file and initialize/calculate the ratio
    Item()
    {
        fr>>name>>p>>w;
        r=p/w;
    }

    string getName()
    {return name;}

    int getWeight()
    {return w;}

    int getProfit()
    {return p;}

    double getRatio()
    {return r;}

private:
    string name;
    int w, p;
    double r;
};


int main()
{
    int n, c;

    //ifstream fr;
    fr.open("inputp1.txt");
    fr>>n>>c; //get n from input file //get capacity


    //create an array of Items objects reading in from the input file based on n
    Item tosteal[n];
    for (int i=0; i<n; i++)
    {
        tosteal[i]= Item();
    }
    fr.close();

    for (int i=0; i<n; i++)
    {
        cout <<"Profit: "<<tosteal[i].getProfit()<<endl;
        cout <<"Weight: "<<tosteal[i].getWeight()<<endl;
        cout <<"Name: "<<tosteal[i].getName()<<endl;
        cout <<"Ratio: "<<tosteal[i].getRatio()<<endl;
    }
}