PCEP exam Question and answers correctly solved PCEP exam
What 4 elements must a language contain?
alphabet, lexis, syntax, semantics
What is machine language?
a rudimentary computer programming language consisting of binary or hexadecimal instructions which a computer can respond to d...
PCEP exam
What 4 elements must a language contain?
alphabet, lexis, syntax, semantics
What is machine language?
a rudimentary computer programming language consisting of binary or
hexadecimal instructions which a computer can respond to directly
What is a instruction list?
- alphabet of machine language
- simplest and most primary set of symbols we can use to give commands to a
computer
What is a high-level programming language?
- similar to natural language - bc they use symbols, words and conventions
readable to humans
- enable to express commands to computers that are much more complex
than those offered by ILs
What is a source code?
a program written in a high-level programming language
,What is a source file?
a file containing source code
What two ways can you use to translate a high level programming language
into a machine language?
- compilation or interpretation
How do compiled programming languages work?
- the source code is translated only once (this must be repeated each time
you modify the source code)
- the program performing this kind of transformation is called called
compiler/translator
- the source code is translated into a executable binary file containing the
machine code that can be directly executed by the computer's CPU
How do interpreted programming languages work?
- the source code needs to be translate each time you want to run the
program
- the program performing this kind of transformation is called an interpreter
- when you distribute the source code, you must also include the interpreter
with it (or the information about interpreter version and any required
dependencies to ensure smooth execution)
,Can language be both compiled and interpreted?
- yes but there are very few cases
Advantages and disadvantages of compilation
+ execution of code usually faster
+ end-user does not need compiler
+ very low risk of ideas theft - compiled code is in machine code - hard to
understand
- compilation itself is very time consuming
- compiler is hardware dependent - the more platforms, the more compilers
Advantages and disadvantages of interpretation
+ code can be run directly after its completion
+ code is stored in programming language = can be run on any machine as it
is translated into machine language each time that it executes
- slower than compiled
- both creator as the end-user need to have the interpreter
Which series was the inspiration for Python´s name?
Monty Python's Flying Circus
, Who is the creator of Python?
Guido van Rossum
What were the 4 main goals of Python creator that he had in mind while
creating it?
- easy and intuitive language
- open source
- code that is as understandable as plain English
- suitable for everyday tasks, short development times
What are the 2 direct competitors of Python?
- Ruby - Yukihiro Matsumoto - innovative and more full of fresh ideas
- Perl - Larry Wall - more traditional and more conservative
For which two areas is Python not suitable?
- low-level programming
- mobile applications
Are Python 2 and Python 3 compatible?
- No, therefore it is better not to rewrite the source code into a different
version, just to improve the existing interpreter
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