IGCSE Computer Science Paper-1: Specimen Questions with Answers 153 - 154 of 164

Question 153

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Discus the Custom Binding and Late Binding.

Explanation

Custom Binding can load an assembly at run time that helps in obtaining information about bout types in that assembly apart from specifying the type we want and invoking methods and access fields.

In Late Binding, the process occurs at run time rather than at compile time. Most script languages use late binding. Here the function being called with arguments is looked up by name at runtime.

Question 154

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What is the meaning of UML Diagrams?

Explanation

UML or Unified Modelling Language Diagram helps in visualizing a software program using a collection of diagrams.

Image of The Unified Modelling Language Diagram

Image of the Unified Modelling Language Diagram

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i) Now a days the Object Management Group is accepting UML as the standard for modeling software development.

ii) There are 13 different types of diagrams: class, activity, object, use case, sequence, package, state, component, communication, composite structure, interaction overview, timing, and deployment. These are further organized into two distinct groups: structural diagrams and behavioral or interaction diagrams:

Structural UML Diagrams: Class diagram, Package diagram, Object diagram, Component diagram, Composite structure diagram and Deployment Diagram.

Behavioral UML diagrams: Activity diagram, Sequence diagram, Use case diagram, State diagram, Communication diagram, Interaction overview diagram, Timing diagram.

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