Using Variables, Declaring Constants in C++

Jan 27, 2017

📄 Contents

␡

What Is a Variable?
Common Compiler-Supported C++ Variable Types
Determining the Size of a Variable Using sizeof
Automatic Type Inference Using auto
Using typedef to Substitute a Variable's Type
What Is a Constant?
Keywords You Cannot Use as Variable or Constant Names
Summary
Q&A
Workshop

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Using `typedef` to Substitute a Variable’s Type

C++ allows you to substitute variable types to something that you might find convenient. You use the keyword typedef for that. Here is an example where a programmer wants to call an unsigned int a descriptive STRICTLY_POSITIVE_INTEGER.

typedef unsigned int STRICTLY_POSITIVE_INTEGER;
STRICTLY_POSITIVE_INTEGER numEggsInBasket = 4532;

When compiled, the first line tells the compiler that a STRICTLY_POSITIVE_INTEGER is nothing but an unsigned int. At later stages when the compiler encounters the already defined type STRICTLY_POSITIVE_INTEGER, it substitutes it for unsigned int and continues compilation.

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