Someone once observed that "the difference between roles and groups is that a user can shift into and out of roles, whereas that user has a group identity (or identities) that are fixed throughout the session."a. Consider a system such as a System V-based UNIX system, in which a process can have exactly one group identity. To change groups, users must execute the newgrp command. Do these groups differ from roles? Why or why not?

a variable of array type holds a reference of object

array are commonly used in computer program to organize data so that a related set of values

array are using zero base indexing it start with 0.

all component of array have same type, two different types doesn't use in single array

if array are store 10 quantities its index value varies from 0 to 9.

it stores 1st quantity value in index value 0 and this process will same till index value 9.

ok that sounds like a app that my brother would like