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

using namespace std;

class ReadSp {
private:
    vector<string> name;
    vector<double> paramA;
    vector<double> paramB;

public:
    void addName(string nm) {name.push_back(nm);};
    string getName(int ind) {return name[ind];};

    void addParamA(double a) {paramA.push_back(a);};
    double getParamA(int ia) {return paramA[ia];};

    void addParamB(double b) {paramB.push_back(b);};
    double getParamB(int ib) {return paramB[ib];};

    int non() {return name.size();};
};

int main () {
    ReadSp sp1;
    string nn;
    double A;
    double B;
    ifstream fin;
    fin.open("sprav.txt");
    while (!fin.eof()) {
        fin >> nn >> A >> B;
        sp1.addName(nn);
        sp1.addParamA(A);
        sp1.addParamB(B);
    }
    fin.close();
    cout << "Загружено элементов: " << sp1.non() << endl;
    cout << "Введите индекс: ";
    int index;
    cin >> index;
    cout << sp1.getName(index) << endl;
    cout << sp1.getParamA(index) << endl;
    cout << sp1.getParamB(index) << endl;
    return 0;
}

***
файл sprav.txt
ASDx6   120 12.5
QWpp4   112 10.5
ZXp09   100 10
TTT 123 23