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Copy contents of One File to another C++

'Copy file in C++' program is given below.
Copies content of file 'a' to file 'b'.

#include <iostream>
#include <fstream>
using namespace std;

int main(){
char line[100];

ifstream is("a.txt");
ofstream os("b.txt");

if (is.is_open()){
while (!is.eof()){
is.getline(line,100,'\n');
os << line << endl;
}
}
else{
cout << "a.txt couldn't be opened. Creat and write something in a.txt, and try again." << endl;
}

return 0;
}

See a better program:
Copy one file to another file C++
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