Economic Thought Of The Twentieth Century And Other Essays (ePub)
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A library is a collection of implementations of behavior, written in terms of a language that has a well-defined interface by which the behavior is invoked. This means that as long as a higher level program uses a library to make system calls, it does not need to be re-written to implement those system calls over and over again. In addition, the behavior is provided for reuse by multiple independent programs. A program invokes the library-provided behavior via a mechanism of the language. For example, in a simple imperative language such as C, the behavior in a library is invoked by using C's normal function-call. What distinguishes the call as being to a library, versus being to another function in the same program, is the way that the code is organized in the system. Library code is organized in such a way that it can be used by multiple programs that have no connection to each other, while code that is part of a program is organized to only be used within that one program. This distinction can gain a hierarchical notion when a program grows large, such as a multi-million-line program. In that case, there may be internal libraries that are reused by independent subportions of the large program. The distinguishing feature is that a library is organized for the purposes of being reused by independent programs or sub-programs, and the user only needs to know the interface, and not the internal details of the library.
- Autor: P. R. Dubhashi
- 2019, Englisch
- Verlag: Concept Publishing Company Pvt. Ltd.
- ISBN-10: 9354391125
- ISBN-13: 9789354391125
- Erscheinungsdatum: 30.06.2019
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- Dateiformat: ePub
- Größe: 0.33 MB
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