Computer Science

a sequence of instructions to perform a specific task with an identifiable name

describes how a subprogram will interact with the main program

used in a subprogram to allow values to be passed into them

Structured programs

Procedures in programs

Functions in programs

Global and local variables in programs

Programming project: subprograms I

Programming project: subprograms II

In this unit pupils will be introduced to structured programming. They will explore the differences between functions and procedures and use functions to return values in programs. They will be introduced to the concept of scope and how parameters can be used to reduce the need for global variables.

Programming: subprograms

an expression that passes control and arguments (if any) to a subprogram

a subprogram that executes a block of code when called but does not return a value

values held in the brackets of a subprogram call, which are passed into a subprogram via the parameters

Variables inside a subroutine

the section of the program where the variable can be accessed and modified

a variable that is defined and visible for use only in specific parts of a program e.g. within a subprogram

a variable that is accessible from all parts of a program

a top-down diagram used to design the structure of the subprograms required for completing a program

a visual representation of an algorithm or program

data that should not be accepted by the program or it will cause an error

data that should either be accepted or rejected by a program, it tests the data right at the boundary of a range

data that should be accepted by a program, this is data that you would expect a user to enter

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Programming: subprograms

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