Write a program test-ascii.cpp that asks the user to input a line of text (which may possibly include spaces). The program should report all characters from the input line together with their ASCII codes.

Sure, here is a simple C++ program that does what you asked for:

#include <iostream>
#include <string>

int main() {
    std::string input;
    std::cout << "Please enter a line of text: ";
    std::getline(std::cin, input);

    for (char c : input) {
        std::cout << "Character: " << c << ", ASCII code: " << static_cast<int>(c) << std::endl;
    }

    return 0;
}

Here's how this program works:

1. It includes the necessary libraries: iostream for input/output and string for using the string data type.
2. It defines the main function where the program starts.
3. It declares a string variable input to hold the user's input.
4. It prompts the user to enter a line of text.
5. It uses std::getline(std::cin, input); to read a line of text from the user. std::getline is used instead of std::cin >> because the latter stops reading input when it encounters a space.
6. It then loops over each character in the input string. For each character, it prints the character itself and its ASCII code. The ASCII code is obtained by casting the character to an integer using static_cast<int>(c).
7. Finally, it returns 0 to indicate that the program has finished successfully.