Mega Code Archive
Save and read double array in a binary file
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#include <iostream>
#include <fstream>
using namespace std;
int main()
{
double fnum[4] = {9.5, -3.4, 1.0, 2.1};
int i;
ofstream out("numbers", ios::out | ios::binary);
if(!out) {
cout << "Cannot open file.";
return 1;
}
out.write((char *) &fnum, sizeof fnum);
out.close();
for(i=0; i<4; i++) // clear array
fnum[i] = 0.0;
ifstream in("numbers", ios::in | ios::binary);
in.read((char *) &fnum, sizeof fnum);
// see how many bytes have been read
cout << in.gcount() << " bytes read\n";
for(i=0; i<4; i++) // show values read from file
cout << fnum[i] << " ";
in.close();
return 0;
}
32 bytes read
9.5 -3.4 1 2.1 "
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