C++ - Read from file to double [closed]

Answer 1

Since your textfile is whitespace delimited, you can use that to your advantage by utilizing std::istream objects who skip whitespace by default (in this case, std::fstream):

#include 
#include 
#include 
#include 

int main() {
    std::ifstream ifile("example.txt", std::ios::in);
    std::vector scores;

    //check to see that the file was opened correctly:
    if (!ifile.is_open()) {
        std::cerr << "There was a problem opening the input file!\n";
        exit(1);//exit or do additional error checking
    }

    double num = 0.0;
    //keep storing values from the text file so long as data exists:
    while (ifile >> num) {
        scores.push_back(num);
    }

    //verify that the scores were stored correctly:
    for (int i = 0; i < scores.size(); ++i) {
        std::cout << scores[i] << std::endl;
    }

    return 0;
}

Note:

It is highly recommended to use vectors in lieu of dynamic arrays where possible for a myriad number of reasons as discussed here:

When to use vectors and when to use arrays in C++?