Using parameters · Procedural

Build the idea

Start with the concept and its key vocabulary.

Key idea

Define and call a procedure that uses every value supplied through its parameters.

Parameters make one procedure useful with many values. They are named in the definition and receive the values supplied by each call. The body should use those parameters directly. If it asks for replacement input, it throws away the caller's data and defeats the purpose of passing parameters.

Parameter

A named value received by a sub-program when it is called.

Parameter list

The parameter names written inside the brackets of a sub-program definition.

Call

An instruction that runs a sub-program and supplies any required values.

Reuse

Calling the same sub-program with different values instead of copying its code.

Keep these in mind

Values in a call match parameters by position.
A string supplied directly in a call needs quotation marks.
The body must use its parameters rather than overwrite them.
Parameters are local to the sub-program.
Clear parameter names make the sub-program easier to understand.

Build the idea

Start with the concept and its key vocabulary.

Key idea

Define and call a procedure that uses every value supplied through its parameters.

Parameter

A named value received by a sub-program when it is called.

Parameter list

The parameter names written inside the brackets of a sub-program definition.

Call

An instruction that runs a sub-program and supplies any required values.

Reuse

Calling the same sub-program with different values instead of copying its code.

Keep these in mind

Values in a call match parameters by position.
A string supplied directly in a call needs quotation marks.
The body must use its parameters rather than overwrite them.
Parameters are local to the sub-program.
Clear parameter names make the sub-program easier to understand.