lst-0023-book.cpp
// https://godbolt.org/z/GoPddTWq6
#include <fstream>
#include <iostream>
using std::cout;
int main() {
std::ofstream file01("testfile.txt", std::ios::out|std::ios::app);
if(file01.fail()) {
cout << "Could not open testfile.txt\n";
} else {
cout << "ok.\n";
}
std::fstream file02;
file02.open("database.db", std::ios::out|std::ios::trunc);
if( !file02 ) {
cout << "Could not open database.db\n";
} else {
cout << "ok.\n";
}
}