The following code example is taken from the book
The C++ Standard Library - A Tutorial and Reference, 2nd Edition
by Nicolai M. Josuttis, Addison Wesley Longman, 2012
Copyright © 2012 by Pearson Education, Inc. and Nicolai M. Josuttis
// header files for file I/O
#include <iostream>
#include <fstream>
void printFileTwice (const char* filename)
{
// open file
std::ifstream file(filename);
// print contents the first time
std::cout << file.rdbuf();
// seek to the beginning
file.seekg(0);
// print contents the second time
std::cout << file.rdbuf();
}
int main (int argc, char* argv[])
{
// print all files passed as a command-line argument twice
for (int i=1; i<argc; ++i) {
printFileTwice(argv[i]);
}
}