What is a high level programming language?
- Language similar to spoken English
- Written as source code
What is a low level programming language?
- Language similar to the computer’s instruction set
- Written in machine code or assembly
What are the advantages of using a high level programming language?
- Easier to write in, understand and debug
What are the advantages of using a low level programming language?
- Quicker to execute
- Can program anything with it (source code is limited to the commands available)
What are the disadvantages of using a high level language?
- Slower to execute
- Not everything can be programmed as source code due to the limited commands available
What are the disadvantages of using a low level language?
- Difficult to write in, understand and debug
What is assembly?
- Low level language
- Uses mnemonics
- Each mnemonic corresponds with a machine code instruction
What are the 3 types of translator?
- Compiler
- Interpreter
- Assembler
What is a translator?
A program that either:
- Converts source code into machine code
- Converts assembly code into machine code
What is a compiler?
A translator that converts into machine code in one go
What is an interpreter?
A translator that translates lines one by one as the program is running
What is an assembler?
A translator that converts assembly into machine code
What are the advantages of compilers?
- The program runs quickly because it has already been translated
- They optimise code
- Compiled programs can be supplied as executable files
What are the advantages of interpreters?
- Instructions are executed as soon as they are translated
- This means when errors occur they can be easily spotted since the program stops running
- This also means less memory is required
What are the disadvantages of compilers?
- Takes up lots of memory because program is translated at once
- The program needs to be recompiled whenever an edit is made to the code
- Program will not run if it contains syntax errors
What are the disadvantages of interpreters?
- Programs run slower since the processor has to wait for each line to be translated before it is run
- Program has to be translated every time it is run
- They don’t optimise code
What does IDE stand for?
Integrated Development Environment
What is an IDE?
A program that allows a user to code and provide assistance with tools such as an RTE and an editor
Name 4 common tools in an IDE
- Editors
- Error diagnostics
- Run-time environment
- Translator
What are editors?
Software that allows programmers to write and edit code
What tools do editors often come with? Why do these help?
- Automatic line numbering
- Syntax highlighting
- Auto-indenting
Increases the readability of code
What does RTE stand for?
Run-time environment
What is an RTE?
Software that allows a program to run on a computer even if It is not designed to run on it
What is the purpose of error diagnostics?
To help programmers to locate and fix bugs
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System Architecture40
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Memory And Storage (part 1)51
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Memory And Storage (part 2)32
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Network Connections And Protocols78
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Network Security39
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System Software29
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Ethical, Legal And Cultural Issues8
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Algorithms28
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Programing Fundementals29
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Producing Robust Programs29
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Boolean Logic10
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Programming Languages and IDEs28
