cpp-demo-project/src/io.cpp

#include "io.h"
#include <iostream>

int read_number()
{
    std::cout << "Enter a number to add: ";
    int x{};
    std::cin >> x;
    return x;
}
void write_answer(int x)
{
    std::cout << "The answer is: " << x << "\n";
}