如何将多组数据存储到结构数组中？

My code is meant to receive a data file and store it into an array of structures. As of now, the code stores data for the first student, but fails to get anything for the consecutive students. How would i get the code to store the data for the rest of the file into consecutive arrays of the structure?

我的代码用于接收数据文件并将其存储到结构数组中。截至目前,该代码存储了第一个学生的数据,但未能为连续的学生提供任何数据。我如何获得将文件其余部分的数据存储到结构的连续数组中的代码?

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

struct student{
string fname, lname, id, classname[20];
char grade[20];
int units[20], unitstaken, unitscompleted, numberofclasses;
float gpa, points[20], avg;
};

void doesitrun(ifstream& fin, string& filename);
void readit(student& temp, ifstream& fin);
int Read_List(student& child, int size);

int main(){
int i = 0;
ifstream fin;
string filename;
student u[20];
doesitrun(fin, filename);


readit(u[i], fin);
Read_List(u[i], 20);


}

void doesitrun(ifstream& fin, string& filename){
bool trueorfalse;
cout << "Enter file name along with location: ";
getline(cin, filename);
cin.ignore(20, '\n');
fin.open(filename.c_str());
if (fin.fail())
    trueorfalse = false;
else
    trueorfalse = true;
while (trueorfalse == false){
    cout << "File does not run. Please try again. " << endl;
    fin.close();
    cout << "Enter file name along with location: ";        

    getline(cin, filename);
    fin.open(filename.c_str());
    if (fin.fail())
        trueorfalse = false;
    else
        trueorfalse = true;
}

}

void readit(student& temp, ifstream& fin){

int i = 0;
getline(fin, temp.lname, ',');
cin.ignore();
getline(fin, temp.fname);
fin >> temp.id;
fin >> temp.numberofclasses;
fin.ignore(10, '\n');

for (i = 0; i < temp.numberofclasses; i++){

getline(fin, temp.classname[i]);
fin >> temp.grade[i];
fin >> temp.units[i];
fin.ignore(10, '\n');
}

}

int Read_List(student child[], int size)
{
ifstream    fin;
int     i = 0;

readit(child[i], fin);
while (!fin.eof())
{
    i++;
    if (i >= size)
    {
        cout << "Array is full.\n";
        break;
    }
    readit(child[i], fin);
}
fin.close();
return i;
}

1 个解决方案

#1

There could be other problem too related to file format, but how about starting with Why is iostream::eof inside a loop condition considered wrong ?

可能还有其他与文件格式相关的问题,但是如何开始使用为什么iostream :: eof在循环条件中被认为是错误的?

Then try something like,

然后试试像,

struct student 
{
    //...
    friend std::istream & operator >> ( std::istream& is, student& temp ) ;
}

std::istream & operator >> ( std::istream& is, student& temp )
{
    readit( temp , is );
    return is ;
}

And in Read_List,

在Read_List中,

while ( fin >> child[i] )
{
   i++ ;
   // ...
}

#1