Define a function called copy_line that takes one argument that is an input stream. When called, copy_line reads one line of input from the input stream given as its argument and writes that line to the screen. You should be able to call your function using either cin or an input-file stream as the argument to your function copy_line. (If the argument is an input-file stream, then the stream is connected to a file before the function is called, so copy_line will not open or close any files.) For example, the first of the following two calls to copy_line will copy a line from the file stuff. dat to the screen, and the second will copy a line from the keyboard to the screen: ifstream fin; fin.open("stuff.dat"); copy_line(fin); copy_line(cin);

Step by step solution

01

Include necessary headers

To work with input streams and file streams, we need to include the necessary header files. Include the following headers at the beginning of your code: ```cpp #include #include ```

02

Define the function signature

Define the function copy_line that takes an input stream (istream) as its argument: ```cpp void copy_line(std::istream &input_stream); ``` Here, the parameter 'input_stream' is a reference to an input stream, which allows us to use either `cin` or `ifstream` objects as arguments.

03

Implement the function

In the function implementation, read one line from the input stream using the `std::getline` function, and then write that line to the screen using `std::cout`. Ensure that the function can handle both input-file streams and the standard input (`cin`). ```cpp void copy_line(std::istream &input_stream) { std::string line; std::getline(input_stream, line); // Read a line from the input stream std::cout << line << std::endl; // Print the line to the screen } ```

04

Test the function with example code

To test the 'copy_line' function, use the example code provided in the exercise: ```cpp int main() { std::ifstream fin; fin.open("stuff.dat"); copy_line(fin); // Copy a line from the file "stuff.dat" to the screen copy_line(std::cin); // Copy a line from the keyboard to the screen return 0; } ``` Here, the input file stream `fin` is opened with the file "stuff.dat" before being passed to the `copy_line` function. Then, the function is called with the argument `std::cin` to read a line from the standard input. After following these steps, you should have a complete program that defines a `copy_line` function that takes an input stream as an argument and writes a line from that stream to the screen.

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