Programming Fundamentals/Typedef - An Alias
An explanation of typedef being used to create an alias data type.
General Discussion[edit | edit source]
The typedef statement allows the programmer to create an alias, or synonym, for an existing data type. This can be useful in documenting a program. The C++ programming language syntax is:
typedef <the real data type> <the alias identifier name>;
Let's say a programmer is using a double data type to store the amount of money that is being used for various purposes in a program. He might define the variables as follows:
Example 1: Regular Definition of Variables[edit | edit source]
double income; double rent; double vacation;
However, he might use the typedef statement and define the variables as follows:
Example 2: Using typedef when Defining Variables[edit | edit source]
typedef double cash; the typedef must be defined before its use cash income; cash rent; cash vacation;
The typedef statement is not used very often by beginning programmers. It usually creates more confusion than needed, thus stick to using the normal data types at first.
Definitions[edit | edit source]
- Allows the programmer to create an alias, or synonym, for an existing data type.