A is a reusable sequence of statements designed to do a particular job. Functions you write yourself are called functions. A is an expression that tells the CPU to execute a function. The function initiating the function call is the , and the function being called is the or function. …
Consider the following program: #include <iostream> int main() { // get a value from the user std::cout << “Enter an integer: “; int num{}; std::cin >> num; // print the value doubled std::cout << num << ” doubled is: ” << num * 2 << ‘\n’; return 0; } This …
The preceding lessons have introduced a lot of terminology and concepts that we’ll use in just about every program we create. In this lesson, we’ll walk through the process of integrating this knowledge into our first simple program. First, let’s create a program that asks the user to enter an …
Literals Consider the following two statements: std::cout << “Hello world!”; int x { 5 }; What are ‘”Hello world!”‘ and ‘5’? They are literals. A literal (also known as a literal constant) is a fixed value that has been inserted directly into the source code. Literals and variables both have …
Unlike some programming languages, C/C++ does not automatically initialize most variables to a given value (such as zero). When a variable that is not initialized is given a memory address to use to store data, the default value of that variable is whatever (garbage) value happens to already be in …
In the previous lesson (), we covered how to define a variable that we can use to store values. In this lesson, we’ll explore how to actually put values into variables. As a reminder, here’s a short program that first allocates a single integer variable named x, then allocates two …
When you write your programs, the compiler will check to ensure you’ve followed the rules of the C++ language (assuming you’ve turned off compiler extensions, as per lesson ). If you have done something that definitively violates the rules of the language, then your program is ill-formed. In most cases, …
The C++ standard defines rules about how programs should behave in specific circumstances. And in most cases, compilers will follow these rules. However, many compilers implement their own changes to the language, often to enhance compatibility with other versions of the language (e.g. C99), or for historical reasons. These compiler-specific …
Continuing our discussion of this diagram from the previous lesson (): Let’s discuss steps 4-7. Step 4: Compiling your source code In order to compile C++ source code files, we use a C++ compiler. The C++ compiler sequentially goes through each source code (.cpp) file in your program and does …
What is C++17? In September of 2017, the ISO (International Organization for Standardization) approved a new version of C++, called C++17. C++17 contains a fair amount of new content New improvements in C++17 For your interest, here’s a list of the major changes that C++17 adds. Note that this list …
