By Mark Lee
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Additional info for C++ Programming for the Absolute Beginner, Second Edition
By the end of this chapter, you will have a good working knowledge of variables. In this chapter, you will learn the following: • What variables are • How to store data • How to declare and assign values to variables • The fundamental types • How to determine the size of a variable • How to use typedef • How to covert hex to decimal • How to cast from one type to another • How to use constants UNDERSTANDING VARIABLES When writing code, we often want to be able to represent concepts. For example, if you were writing a fantasy role-playing game, you might want to be able to 26 C++ Programming for the Absolute Beginner, Second Edition represent how many experience points the player has.
Needed to declare the main() function. Needed to declare the main() function. Used to rename types. const const_type const_name = value; int variable_name; short variable_name; long variable_name; float variable_name; double variable_name; bool variable_name; string variable_name; unsigned int_type variable_name; return 0; sizeof(variable_type_or_name) int main(void) int main(void) typedef type new_name; As we indicated, keywords are the heart of the C++ language. They each have a special meaning and purpose.
Numbers are the foundation for everything that happens on the computer. Having a good grasp on numbers is essential in the computer world. In this section, you find out about basic math, the modulus operator, and how to use integers (see Chapter 2 for more on integers). INTRODUCING INTEGERS Computers can store information many ways. For now, however, we cover the basics on integers and how to use them. Integers are all the whole numbers, including zero and the positive and negative numbers. 5 is not an integer.
C++ Programming for the Absolute Beginner, Second Edition by Mark Lee