在我的代码中“不匹配'operator >>'”是什么意思？

Question

I'm trying to look for what is wrong in this fragment of code. It says the error : [Error] no match for 'operator>>' in 'inputData >> Player[i].AthleteType::firstName ' for the line:

inputData >> Player[i].firstName;

Can someone tell me what this means? And also if this is the right way to read data from a file that looks like this:

Peter Gab 2653 Kenya 127
Usian Bolt 6534 Jamaica 128
Other Name 2973 Bangladesh -1
Bla Bla 5182 India 129
Some Name 7612 London -1



//this is the structure
struct AthleteType
{
    string firstName[SIZE];
    string lastName[SIZE];
    int athleteNumber[SIZE];
    string country[SIZE];
    int athleteTime[SIZE];
};


void readInput(int SIZE)
{
    AthleteType Player[SIZE];

    ifstream inputData("Athlete info.txt");

    int noOfRecords=0;

    for (int i=0; i < SIZE; i++, noOfRecords++)
    {
        inputData >> Player[i].firstName; 
        inputData >> Player[i].lastName;
        inputData >> Player[i].athleteNumber;
        inputData >> Player[i].country;
        inputData >> Player[i].athleteTime;
    }

    for (int i=0; i < noOfRecords; i++)
    {
        cout << "First Name: " << Player[i].firstName << endl;
        cout << "Last Name: " << Player[i].lastName << endl;
        cout << "Athlete Number: " << Player[i].athleteNumber << endl;
        cout << "Country: " << Player[i].country << endl;
        cout << "Athlete Time: " << Player[i].athleteTime << endl;
        cout << endl;
    }
}

Answer 1

There are several problems with your attempt. Firstly your struct

struct AthleteType {
    string firstName[SIZE];
    string lastName[SIZE];
    int athleteNumber[SIZE];
    string country[SIZE];
    int athleteTime[SIZE]; 
};

Your compiler error is telling you that you can't read into an array of strings, inputData >> firstName[SIZE];. One string at a time is fine of course.

If i peer into my crystal ball, I see that you want to store several athletes. This should be done using a vector.

vector<Athlete> athletes;

And the struct can then be

struct Athlete
{
    string firstName;
    string lastName;
    int athleteNumber;
    string country;
    int athleteTime;
};

One athlete per object.

When reading from an input file you want to read based on read success.

   while(inputData >> athlete){  
       athletes.push_back(athlete); 
   }

You can do this by overloading operator>> (istream&, Athlete& ); or you can write a function that does a similar job.

istream& readAthlete(istream& in, Athlete& at){
    return in >> at.firstName >> at.lastName >> at.athleteNumber >> ... and so on;
}

Now the read function can be written as

vector<Athlete> readInput(string filename){
    vector<Athlete> athletes;
    ifstream inputData(filename);
    Athlete athlete;
    while(readAthlete(inputData, athlete)){
        athletes.push_back(athlete);
    }
    return athletes;
}

This is not tested code, it might work, it might not work, but it should give you a reasonable path forward.