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Chapter 1: The Way Of The Program
- 1.1 Programming Language
- Computers can only run
programs that have been
written in 'low-level
languages.' If written in
'high-level languages', it has
to be processed.
- Advantages Of High Level
Language
- It is easier to program
in a high-level
language.
- High-level language take
less time to write.
- It is easier to program
in a high-level
language.
- Advantages Of Low
Level Language
- Low level language does not have
to be processed before it is ran
through a machine
- Low level language does not have
to be processed before it is ran
through a machine
- Advantages Of High Level
Language
- What Is A Complier And An Interpreter?
They both read the program and
translates it completely before the
program starts running.
- Python programming is
execucted through an
interpreter
- Python programming is
execucted through an
interpreter
- Computers can only run
programs that have been
written in 'low-level
languages.' If written in
'high-level languages', it has
to be processed.
- 1.2 What Is A
Program?
- A program is a sequence of instructions
that specifies how to perform an action.
- The action might be mathematical, such as
solving equations but it can also be a symbolic
action, such as searching and replacing text in a
document.
- Here are a few examples of
basic instructions used in
programming
- Input: Get data from the
keyboard, a file, or some other
device.
- Output: Display data on the screen or
send data to a file or other device.
- Math: Perform basic mathematical
operations like addition and
multiplication.
- Input: Get data from the
keyboard, a file, or some other
device.
- The action might be mathematical, such as
solving equations but it can also be a symbolic
action, such as searching and replacing text in a
document.
- A program is a sequence of instructions
that specifies how to perform an action.
- 1.3 What Is
Debugging?
- Here are a few types of errors
that would need to be
debugged.
- Syntax errors: Python can only
execute a program if the
syntax is correct.
- Runtime errors: they are called
this because the error does not
appear until after the program
has started running.
- Semantic errors: If there is an error,
the computer will not generate any
error messages, but it will not do the
right action.
- Syntax errors: Python can only
execute a program if the
syntax is correct.
- Here are a few types of errors
that would need to be
debugged.
- 1.4 Formal and Natural
Lanuages
- Natural languages are the
languages people speak, such as
English, Spanish, and French and
they have evolved naturally.
- Formal languages are languages that are
used by people for particular applications.
For example, the language that
mathematicians use is a formal language that
is particularly good at showing relationships
in numbers and symbols.
- Formal languages tend to have
strict rules. For example, 3 + 3
= 6 is correct mathematical
statement, but 3 + = 3 $ 6 is
not.
- Natural languages are the
languages people speak, such as
English, Spanish, and French and
they have evolved naturally.
- 1.5 The First Program
- Normally, the first program you write in a new language is called
“Hello, World!” because all it does is display the words “Hello,
World!”. In Python, it looks like this:
- print 'Hello, World!'
- It will look like this when the program has ran.
- Hello World
- Hello World
- It will look like this when the program has ran.
- print 'Hello, World!'
- Even though in the other Python applications, the first
instruction would be written as:- print 'Hello, World!', in Python
3, the instruction for printing is slightly different: print ('Hello,
World!')
- But, it still prints the text how it did before.
- But, it still prints the text how it did before.
- Normally, the first program you write in a new language is called
“Hello, World!” because all it does is display the words “Hello,
World!”. In Python, it looks like this:
- 1.6 Debugging
- Debugging be anything so simple. It
could be that you spelt the instruction
wrong.
- For example: prnt 'Hello, World!'
- For example: prnt 'Hello, World!'
- Or it could be that you've missed out some very
important punctuation!
- For example: print 'Hello, World!
- For example: print 'Hello, World!
- Debugging be anything so simple. It
could be that you spelt the instruction
wrong.
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