Key Concepts
A data type is characterized by how the data is structured and stored and also by what operations are possible. An abstract data type (ADT) specifies in an abstract manner the properties and operations characterizing a type. Conceptually, you can translate an ADT to a particular programming language in two steps. The first step is defining the programming interface. In C, you can do this by using a header file to define type names and to provide function prototypes that correspond to the allowed operations. The second step is implementing the interface. In C, you can do this with a source code file that supplies the function definitions corresponding to the prototypes.
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