Computer Science
Define a 'Parameter'
A piece of data that is put into a function/procedure so that a task can be done
What is passing by value
Where a copy of the value is set as the parameter (This copy becomes a local variable & only affects the copy, not the actual value)
What is passing by reference
Where a variable is set as a parameter (The function then changes the original value of the variable)
Define a 'local variable'
A variable declared within a subroutine & cannot be accessed outside the subroutine
Define a 'Global Variable'
A variable declared outside any modules & can be accessed in any part of the program
Explain what Modular programming is
Breaking down problems into smaller more manageable problems
Explain what procedural proogramming is
A program written in a high level language. The language is written in a series of step by step instructions
Define 'Recursion'
A programming technique where a subroutine calls itself to solve a problem
Give 3 features of recursive subroutines
- The subroutine must call itself
- Must have a stopping base (a number it reaches after a finite number of calls)
What is an IDE
Integrated Development Environment, is a software tool which helps to compile, edit and debug code
Give 4 features of an IDE
- Setting a breakpoint to stop a program on a specific line
- Syntax error highlighting
- Setting a watch on a variable to see its value when it changes
- Code commenting for documenting code
What is the sequence programming construct
Where code is run one by one
What is the selection programming construct
A statement used to select a statement which will be executed depending on a condition
What is the iteration programming construct
Repeating a block/line of code (Count controlled or condition controlled)
Describe the use of local variables
- Defined at the start of the subroutine
- It can only be accessed within the subroutine
- Can overwrite global variables
- Once the program exits the function, local variables are lost (temporary)
What is a breakpoint for
Allows you to top a program at any time during execution to watch a variable
What is the puropse of stepping?
A debugging mode that allows developers to execute the program one line at a time
Define a Variable
A named memory location used to store data which can be changed
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