Welcome back, coding explorer! Today, we're taking a new turn — mastering Input/Output, arithmetic expressions, and variable applications in C++. These skills are stepping stones to creating programs that interact with users. Brace yourself for our journey!

• First, we'll explore the lands of Input/Output in C++.
• Next, our mission will be collecting user inputs and displaying outputs.
• Then, we'll dig into the treasure trove of arithmetic expressions.
• Finally, we'll learn to apply variables within these expressions.

By the end of our journey, you'll wield the prowess of basic forms of Input/Output in C++, crafting arithmetic expressions, and using variables within them.

Imagine programming as a river with two streams: std::cin and std::cout. std::cin pours data into your program, and std::cout drains data from your program to the user.

Think of std::cin and >> as a way to gather user input, and std::cout and as the microphone for your program to speak to users. However, due to platform constraints, we'll use constants instead of in our examples.