What are the design issues for functions?
The following design issues are specific to functions: Are side effects allowed? What types of values can be returned? How many values can be returned?
What are the two types of subprograms?
PL/SQL has two types of subprograms called procedures and functions. Generally, you use a procedure to perform an action and a function to compute a value. Like unnamed or anonymous PL/SQL blocks, subprograms have a declarative part, an executable part, and an optional exception-handling part.
What are two reasons for using subprograms alias functions )?
Two important advantages of using subprograms are reuse and abstraction. In our Sort program we saw how subprograms allow us to reuse the same code. Although the Sort program does many swaps, we only have to write the Swap procedure one time. Each call to Swap uses the same code that we wrote for the procedure.
What are the two main ways of passing parameters to subprograms?
There are 2 ways that a subprogram can gain access to the data that is to process: through direct access to nonlocal variables or through parameter passing. The binding of actual parameters to formal parameters is done by simple position: the first actual parameter is bound to the first formal parameter and so forth.
What is a subprogram example?
In computer programming language: Control structures. …is an example of a subprogram (also called a procedure, subroutine, or function). A subprogram is like a sauce recipe given once and used as part of many other recipes. Subprograms take inputs (the quantity needed) and produce results (the sauce).
What are the distinct categories of subprograms?
There are two distinct categories of subprograms—procedures and functions— both of which can be viewed as approaches to extending the language. All subprograms are collections of statements that define parameterized computations. Functions return values and procedures do not.
What are the advantages of subprograms?
Benefits of using subprograms
- Subprograms are usually small in size, which means they are easier to write, test and debug than programs.
- Subprograms can be saved separately as modules and used again in other programs.
- A subprogram may be used repeatedly at various points in the main program.
What is protocol of a subprogram?
The protocol of a subprogram is its parameter profile plus, if it is a function, its return type. A subprogram declaration provides the protocol, but not the body, of the subprogram. A formal parameter is a dummy variable listed in the subprogram header and used in the subprogram.
What are the three 3 semantics models of parameter passing?
What are the three semantic models of parameter passing? -They can do both. Simply: in mode, out mode, and inout mode. the value of the actual parameter is used to initialize the corresponding formal parameter.
