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IB Glossary - P

IB Glossary letter P

parameter passing The assignment of values to parameters to be used in a procedure.
parity bit A binary digit appended to a group of binary digits to make the sum of all the digits, including the appended binary digit, either odd or even as established beforehand.
pass-by-reference The parameter-passing mechanism by which the address of a variable is passed to the subprogram called. If the subprogram modifies the formal parameter, the corresponding actual parameter is also changed. In Java, all objects, are pass-by-reference.
pass-by-value The parameter passing mechanism by which a copy of the value of the actual parameter is passed to the calling procedure. If the called procedure modifies the formal parameter, the corresponding actual parameter is not affected.
peripheral device Any device that can communicate with a particular computer, for example: input/output units, auxiliary storage, printers.
pointing device An instrument, such as a mouse, trackball or joystick, used to move an icon on the screen.
primary memory The part of the memory where the data and programs that are in use at the time are stored.
primitive data type Integer, real, character or Boolean data types.
private class members Members of a class that are only accessible from methods inside the class.
protocol An internationally agreed set of rules to ensure transfer of data between devices. A standard protocol is one that is recognized as the standard for a specific type of transfer. For example, TCP/IP.
prototyping The construction of a simple version of a system in the design stage, showing the user interface but without full processing behind it.
pseudo code An artificial language used to describe computer program algorithms without using the syntax of any particular language.
public class members Members of a class that are accessible from anywhere and from any class.
Created by: Stanman66