Question

How to write array of doubles to binary file in C++

Answer 1

#include <iostream>
#include <fstream>

using std::cout;
using std::endl;

int main()
{
	std::ofstream out("d:\\test.bin", std::ios::out | std::ios::binary);

	if (!out) {
		cout << "Error open output file" << endl;
		return 1;
	}

	double arr[3] = { 1.65, 3.14, 7.89 };

	out.write((char *)arr, sizeof(arr));

	out.close();

	return 0;
}

/*
run:

test.bin
--------
ffffffת?…כQ¸	@ֲץ(\@

*/

 

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