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17 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What are 3rd generation languages?
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Sequential / imperative languages, the programmer must give a step by step solution to the problem.
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Example: BASIC, C, C++, Pascal
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What is a fourth generation programming language?
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A declarative language with a knowledge base, facts and rules.
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Example: SQL
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What are the key features of a low level language? (5/6 correct or fail)
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• Lacks portability / Designed specifically for certain computers
• Machine orientated • Uses mnemonics for instructions • and variable names for addresses • Uses labels • One to one correspondence between language and machine code. |
Example: Assembly
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What is a class? (Object Orientated Programming)
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A template (or blueprint) that contains methods and attributes.
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What is encapsulation? (Object Orientated Programming)
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Where objects can only be accessed through their methods, indirectly.
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What is the definition of an object? (Object Orientated Programming)
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An instantiation of a class.
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What is polymorphism?
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When a class derived from the super-class changes or adds methods and attributes.
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What is the definition of a procedural language/program?
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Step by step instructions to 'explain' how to solve a problem.
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• 3rd Generation
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What is the definition of a declarative language/program?
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• State what to achieve without giving detailed steps.
• Uses facts and rules. |
• 4th Generation
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What is a parameter?
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• A variable that is supplied to a function/procedure.
• Passed by VALUE (actual data) • or by REFERENCE (variable name containing the data) |
Example:
Call TempConversion(20) |
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What is an argument?
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• A variable declared within a function or procedure.
• Parameters are passed to arguments. |
Example:
Function TempConversion(Temperature as Integer) |
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What are the key points of top down design? (5/6 correct or fail)
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• Successively break tasks into simpler tasks, until tasks can be programmed.
• Clear program structure. • Easier to write programs as a series of modules. • Identify common or standard modules. • Tasks can be shared between many programmers according to their expertise. • Much easier to debug. |
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What is the definition of a procedure or function?
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A subroutine that performs a specific task...
• ...is given an identifier... • ...and can be used as a program instruction. |
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What is a global variable?
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A variable that can be used throughout the entire program including all procedures.
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What is a local variable?
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• A variable that is restricted to one procedure.
• Therefore the same variable name may be used in a different procedures. |
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What are the main problems with global variables?
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• Difficult to trace errors...
• ...due to conflicts or changes of value in shared modular programs. |
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What is the accumulator?
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• Temporary storage in the ALU...
• ...which holds data being processed. • Deals with the input and output of the processor. |
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