double.cpp

#include <iostream>
#include <fstream>

using namespace std;

const int size = 65536;

void store();
double* load();

int main() {
    store();
    double numbers[size];
    for (int i = 0; i < size; i++) {
        numbers[i] = i * 123456.789 + 2345.4321;
    }

    double* test = load();
    for (int i = 0; i < 10; i++) {
        if (test[i] != numbers[i]) {
            cout << i << endl;
            cout << test[i] << endl;
            cout << numbers[i] << endl;
        }
    }
    return 0;
}

void store() {
    ofstream file;
    file.open("doubles.ff", ios::out | ios::binary);
    double numbers[size];
    for (int i = 0; i < size; i++) {
        numbers[i] = i * 123456.789 + 2345.4321;
    }
    file.write(reinterpret_cast<char *>(numbers), sizeof(double) * size);
    file.close();
}

double* load() {
    ifstream file;
    file.open("doubles.ff", ios::in | ios::binary);
    double *numbers = new double[size];
    file.read(reinterpret_cast<char *>(numbers), sizeof(double) * size);
    return numbers;
}