Bjarne Stroustrup “Programming Principles and Practice Using C++”
Chapter 11 Exercise 9 Read
Using std_lib_facilities.h by Bjarne Stroustrup.
[code language=”cpp”]
// Philipp Siedler
// Bjarne Stroustrup’s PPP
// Chapter 11 Exercise 9 Read
#include "std_lib_facilities.h"
int main()
try
{
//open an istream for binary input from a file:
cout << "Please enter input file name\n";
string in;
string iname = "input/";
cin >> in;
iname += in;
ifstream ifs{ iname, ios_base::binary }; //note: stream mode
//binary tells the stream not to try anything clever with the bytes
if (!ifs) error("can’t open input file", iname);
else {
cout << "file opened" << endl;
}
//open an ostream for binary input from a file:
cout << "Please enter output file name\n";
string out;
string oname = "output/";
cin >> out;
oname += out;
ofstream ofs{ oname };
vector<int> v;
//read from binary file:
for (int x; ifs.read(as_bytes(x), sizeof(int));) { //note: reading bytes
v.push_back(x);
}
//cout binary file:
for (int x : v) {
cout << x << endl;
ofs << x << endl;
}
keep_window_open();
}
catch (runtime_error e) {
cout << e.what() << endl;
keep_window_open();
}
catch (…) {
cout << "Exiting" << endl;
keep_window_open();
}
[/code]
Output: Please enter input file name ch10_9_input_2.txt file opened Please enter output file name p409_9_read_out.txt 1684955424 544174880 1948283753 Please enter a character to exit
Input-File: ch10_9_input_2.txt and so is this
Output-File: p409_9_read_out.txt 1684955424 544174880 1948283753
