Hiried A+ programming Interview Questions with Answers PDF
1. What is A+ programming language?
A+
is a powerful and efficient programming language. It is freely
available under the GNU General Public License. It embodies a rich set
of functions and operators, a modern graphical user interface with many
widgets and automatic synchronization of widgets and variables,
asynchronous execution of functions associated with variables and
events, dynamic loading of user compiled subroutines, and many other
features. Execution is by a rather efficient interpreter. A+ was
created at Morgan Stanley. Primarily used in a withstood the demands of
real world developers over many years. Written in an interpreted
language, A+ applications tend to be portable.
2. Who Wrote A+ ?
A+ is written by Arthur Whitney at Morgan Stanley in 1988 .
3.What is APL programming language?
APL
(named after the book A Programming Language) is a programming language
developed in the 1960s by Kenneth E. Iverson. Its central datatype is
the multidimensional array. It uses a large range of special graphic
symbols to represent most functions and operators, leading to very
concise code. It has been an important influence on the development of
concept modeling, spreadsheets, functional programming, and computer
math packages.It has also inspired several other programming
languages.It is still used today for certain applications.
Source :Wikipedia.
4. What were the changes that the A+ language brought about in APL?
The A+ language implements the following changes to the APL language:
• An A+ function may have up to nine formal parameters.
• A+ code statements are separated by semicolons, so a single statement may be divided into two or more physical lines.
• The explicit result of a function or operator is the result of the last statement executed.
•
A+ implements an object called a dependency, which is a global variable
(the dependent variable) and an associated definition that is like a
function with no arguments. Values can be explicitly set and referenced
in exactly the same ways as for a global variable, but they can also be
set through the associated definition.
5. List some features of A+ programming language
• An A+ function may have up to nine formal parameters.
• A+ code statements are separated by semicolons.
• The explicit result of an operator or function is the result of the last statement executed.
• A+ implements an object called a dependency.
6. Explain Nonscalar Primitive Functions
The A+ nonscalar primitive functions can be grouped, among many other ways, in these eight categories:
• Informational functions: Shape, Count, Depth, Type;
•
Structural functions: Reshape, Interval, Restructure, Reverse, Rotate,
Transpose, Transpose Axes, Ravel, Item Ravel, Enclose, Disclose, Rake,
Raze, Partition, Take, Drop, Replicate, Expand, Catenate, Laminate;
• Selection functions: Pick, Choose, Bracket Indexing, Right, Left, Null, Separate Symbols;
• Computational functions: Matrix Inverse, Solve, Deal, Pack, Unpack, Encode, Decode;
• Comparison functions: Match, Member, Find, Bins, Grade up, Grade down, Partition Count;
• Format and representation functions: Format, Default Format, Cast;
•
Specificational functions: Assignment, Append, Bracket Indexing
Selective Assignment, Replace All, Selective Assignment; Beam;
•
Evaluative, display, and control functions: Execute, Execute in
Context, Protected Execute, Value, Value in Context, Result, Signal,
Print, Stop; Time.
7. What type of control statements are used in A+?
Unlike
functions and operators, which take arguments and return results,
control statements are primarily used for their side effects, although
they always do have explicit results. Some control statements also have
syntax that differs from that of functions taking arguments. The
keywords are reserved: the words or names case, do, if, else, and while
can appear only as parts of control statement
8. How numbers are represented in A+?
The
machines on which A+ is run represent numbers in binary (base 2), for
efficient storage and computation. A+ (via C) represents integers in 32
bits (binary digits) and floating-point numbers in 64. The largest
integer representable in this way is (2*31)-1 and the smallest is ¢2*31
(-2147483648); the greatest magnitude representable as a floating-point
number is approximately 1.7977e+308.
In display and print, of
course, A+ represents numbers in decimal. People tend to think in
decimal and their input is usually decimal. Numbers like .1 and .01 seem
exactly representable intrinsically (as they are in decimal), but, in
fact, these numbers cannot be exactly represented in binary, and decimal
to binary and binary to decimal conversions are one source of
imprecision.
9. What is the rank operator?
The
concepts of leading axis and item are generalized by treating an array
as a frame defined by the array’s leading m axes holding cells of rank n
defined by the array’s trailing n axes, where m+n is the rank of the
array. A function f is applied to all cells of rank n with the
expression f@n. The rank operator (@) applies uniformly to all functions
of one or two arguments: primitive, derived, or defined, except
Assignment and (because of its syntax) Bracket Indexing (@ does apply to
Choose, which is semantically equivalent).
10. List some Scalar Monadic Functions of A+ programming ?
+ – × ÷ | ⌈ ⌊ * ⍟ ○ ! ~ ? ∊
Latest A+ programming Interview Questions for freshers and Experienced pdf
