C++ read from files

Question

Hello i am beginner at c++ and now just take few test of exams to learn but now i face a problem its kind missing knowledge of c++ , so i have a file with u2.txt and his content is

 3 5
Petras Rasa // name of dancer 
3 1 5 8 10 // scores for a technique 
5 6 7 8 9 // scores for art 
Rita Jurgis
6 5 8 5 8
9 8 7 6 5
Rasa Linas
10 10 10 10 10
8 8 8 8 8

so task said that the first two numbers shows dancer and judge numbers , second line shows name of dancer the line below shows scores of
technique and one line below show scores of artistry , and so its 3 dancers with a scores below .

So now i need to write a function witch read that file and stores a scores and names into variables , i am using class and array system , so i will be storing them there , the thing is i do not really know how to read such file because till now i was learning to real a file like Name,54 or so so i was using a getline and end the line with ',' but there is no comma hare so i face a problem hare this is my function till now :

const string U2 = "U2.txt";
const string U2rez = "rez.txt";

class Results
{
public:
    string name;
    int scorestech;
    int scoresart;
};


int main()
{
    Results v[5]
    return 0;
}

void Freading(const string fn,Results v[])
{
    int alldancers;
    int alljudge;
    ifstream fin(fn.c_str());
    fin >> alldancers >> alljudge;
    for(int a =0; a < 3; a++){


    }

}

so now i need to read this file and count a scores of art and technique of each dancer

Answer 1

#include <iostream>
#include <string>
#include <fstream>

using namespace std;

const string U2 = "U2.txt";
const string U2rez = "rez.txt";

class Results
{
public:
    string name;
    int scorestech;
    int scoresart;
};

void Freading(const string fn,Results v[]);

int main()
{
    Results v[5];
    Freading(U2,v);
    return 0;
}

void Freading(const string fn,Results v[])
{
    int alldancers;
    int alljudges;
    int biggest = 0;
    int smallest = 99;
    ifstream fin(fn.c_str());
    fin >> alldancers >> alljudges;
    fin.ignore();
    for(int a =0; a < alldancers; a++){
        int biggest = 0;
        int smallest = 99;
        int totaltech = 0;
        int totalart = 0;

        getline(fin, v[a].name);

        for(int b = 0; b < alljudges; b++)
        {
            int scores;
            fin >> scores;
            totaltech += scores;
        }
        for(int b =0; b < alljudges; b++)
        {
            int scores;
            fin >> scores;
            totalart += scores;
        }
        v[a].scorestech = totaltech;
        v[a].scoresart = totalart;
        cout << v[a].name << endl;
        cout << v[a].scorestech <<endl;
        cout << v[a].scoresart <<endl;

    }
    fin.close();
}

this is what i done so far but the result i got is :

Petras Rasa
27
35

0
45

0
45

ware i did mistake or what i did wrong , because somehow when the loop goes second time it doesn't capture a name of the second dancer

Answer 2

Before asking a question like this, you should have search more on this, anyway try the method given in below.

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

void main ()
{
    string line_one_by_one;
    ifstream inputfile;
    inputfile.open ("names.txt");
        while(!inputfile.eof) // To get you all the lines.
        {
            getline(infile, line_one_by_one); // Saves the line in line_one_by_one
        }
    inputfile.close();
    system ("pause");
}

What you have to do is identify each line and storing things you need. further read string to int conversion in c++.

read :

http://www.cplusplus.com/reference/istream/istream/read/

http://www.cplusplus.com/reference/string/string/?kw=string

Answer 3

Rezultatai v[5], besides missing a semi-colon, defines a old-style, fixed-length array. That's incorrect, the second number in the file tells you how many judges there are.

Instead, use std::vector<Type>. That can vary its length.

And I'm guessing (since you didn't use English) that for this example you actually should have had 3 Rezultatai, one for each dancer. Each of those should have 2x5 scores.