An example of a simple type system is that of the C language. The portions of a C program are the function definitions. One function is invoked by another function. The interface of a function states the name of the function and … See more

The term polymorphism refers to the ability of code (especially, functions or classes) to act on values of multiple types, or to the ability of different instances of the same data structure to contain elements of different types. Type systems that allow polymorphism … See more

Many static type systems, such as those of C and Java, require type declarations: the programmer must explicitly associate each variable with a … See more

Formally, type theory studies type systems. A programming language must have the opportunity to type check using the type system … See more

The process of verifying and enforcing the constraints of types—type checking—may occur at compile time (a static check) or at run-time (a dynamic check). If a language specification requires its typing rules strongly (i.e., more or less allowing only those automatic See more

Many type systems have been created that are specialized for use in certain environments with certain types of data, or for out-of-band See more

Some languages like C# or Scala have a unified type system. This means that all C# types including primitive types inherit from a single root … See more