ch2-Scopy (Copy files using a string)

Chapter_2     Exercise_2-2     HeYou

FillString     Exercise_2-3

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Scopy.cpp     TCP1, p. 111         download

// Copy one file to another, a line at a time
#include <string>
#include <fstream>
using std::string;
using std::ifstream;
using std::ofstream;

int main()
{
ifstream in("Scopy.cpp"); // Open for reading
ofstream out("Scopy2.cpp"); // Open for writing
string s;

while(getline(in, s)) // Discards newline char
{out << s << "\n";} // must add it back
}
/*
g++ Scopy.cpp -o Scopy
./Scopy

g++ Scopy2.cpp -o Scopy2
./Scopy2

rm Scopy2* // clean
*/

Notes:

It is good coding practice to enclose in braces the single statement of a loop, like while() above. It is easier to read, to delimit from other parts of the code, and you may decide to add other statements later on.
You may compile and run Scopy2.cpp, with the same result (Scopy2.cpp will be overwritten with exactly the same content):
g++ Scopy2.cpp -o Scopy2
./Scopy2
At the end we remove the created files Scopy2.cpp and Scopy2:
rm Scopy2*

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