In This Chapter
Declaring different types of variables
Using floating-point variables
Declaring and using other variable types
The most fundamental of all concepts in C++ is the variable — a variable is like a small box. You can store things in the box for later use, particularly numbers. The concept of a variable is borrowed from mathematics. A statement such as
x = 1
stores the value 1 in the variable x. From that point forward, the mathematician can use the variable x in place of the constant 1 — until he changes the value of x to something else.
Variables work the same way in C++. You can make the assignment
x = 1;
From that point forward in the execution of the program, the value of x is 1 until the program changes the value to something else. References to x are replaced by the value 1. In this chapter, you will find out how to declare and initialize variables in C++ programs. You will also see the different types of variables that C++ defines and when to use each.
A mathematician might write ...