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35 Cards in this Set
- Front
- Back
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What is a variable |
A named location in the computer's memory that can be used to store a value. E.g. words and numbers |
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Name the variable type A string of characters, such as a word or phrase |
String |
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The definition of integer |
A whole number |
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Name the variable type a numbee with a decimal point. |
Real ir float or floating point number |
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Definition of boolean |
A true or false statement |
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What type of variable is Dave12 |
String |
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What type of variable is 1025 |
Integer |
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What type of variable is 3.15 |
Float/ real |
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What type of vatiable is a true or false statement |
Boolean |
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What type of variable is 01620-823562 |
String |
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Which type of program code is written in a format resembling English? |
Source code |
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Which type of programming language uses mnemonics to represent instructions? |
Assembly code |
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What type of code is made up of ones and zeroes |
Machine code |
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What is the name of the suite of programs that helps the computer to manage files, memory, tasks and input-output operations? |
The operating system |
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A phython program contains that statement : age= 15 What type of variable is age? |
Integer |
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What python function can be used to convert strings to floating point numbers? |
The float () function |
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How are string values shown in pythan programs? |
They have quote marks around them |
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What type of statement is used for testing conditions |
IF statements |
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What determines the degree of accuracy of a floating point number represented in binary |
The size of the mantissa |
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What does the exponent do |
The exponent determines ths range of numbers that can be represented in a floating point number represented in binary |
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What is the job of the CPU and what does CUP stand for |
COMPUTER PROCESSING UNIT or processor, executes programs |
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What is main memory |
Primary storage or main memory holds the programs currently being executed abd the data they are processing. |
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What is backing storage |
Secondary storage or backing storage such as hard disks or flash drives store programs and data |
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Name 2 input devices |
Mouse Keyboard |
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Name 2 output devices |
Display screens Printers |
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What does ALU stand for and what does it do |
ARITHMETIC AND LOGIC UNIT executes the program instructions, carrying out calculations, boolean operations and xomparisons |
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Name the 3 parts of the CPU |
ALU Registers Control unit |
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Name the 2 busses |
Address bus Data bus |
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What is normal data |
Data the program is likely to encounter during a typical run. |
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What is extreme data |
Data at the boundaries of the programs capabilities |
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What is exceptional data |
Data that is incorrect and should not be processed by the program |
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Give 2 advantages of using a compiler |
All errors can be found on a single pass Generated code is highly optimised and runs efficiently Once the program has been compiled it cam be execuyed many times without recompiling |
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Give 1 disadvantage of using a compiler |
Errors cant be found until the program is complete and ready for compilation Compilation of large programs can take a long time If anything is changed, the whole program needs to be recompiled |
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Give 1 advantage of using interpreters |
Errors can be located during program development Programs can be run again as soon as they are amended- no need to recompile |
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Give 2 disadvantages to using a interpreter |
Programs generally stop after the first error is encountered, so it may take several runs to find them all. Execution time is slow in comparison to compiled code. Programs cannot be optimised |
