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Strong and weak typing
In computer programming, programming languages are often colloquially classified as strongly typed or weakly typed (loosely typed). These terms do not have a precise definition, but in general, a strongly typed language is more likely to generate an error or refuse to compile if the argument passed to a function does not closely match the expected type. On the other hand, a very weakly typed language may produce unpredictable results or may perform implicit type conversion. A different but related concept is latent typing.
== History ==
In 1974, Liskov and Zilles defined a strongly-typed language as one in which "whenever an object is passed from a calling function to a called function, its type must be compatible with the type declared in the called function."
In 1977, Jackson wrote, "In a strongly typed language each data area will have a distinct type and each process will state its communication requirements in terms of these types."
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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