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DAV J277 2.5

2.5 Programming Languages and IDEs

QuestionAnswer
What are the features of a High level language? Aimed at humans/programmers English like syntax Hardware independent/portable Needs to be translated into machine code before it can be run by the computer.
What is Assembly language? Type of low level language Made of mnemonics Each instruction translates directly to machine code Suitable for systems where efficiency or size of code are important
What is Machine code? Code executed by CPU/ not readily understandable by humans Binary instructions Specific to particular type of computer/not portable Does not need to be translated to be understood by CPU
What is a Translator? Translates source code written in a high level language into machine code. Two types: compiler & interpreter
What is a Compiler? Translates the whole program as a complete unit into machine code. …the machine code is saved as an executable file (EXE) …errors are all reported at the end …compiler doesn’t need to be present to run the executable file (end user does not need compiler)
What is an Interpreter? Translates one line of high level code at a time … and executes it line by line (does not create executable file) … stops when it finds an error … can be resumed It is quicker to re-interpret than to re-compile but interpreter ALWAYS needs to be present to run the code
What is an IDE? Integrated development environment. The program you use to write code. Features include: Code editors. Error diagnostics. Run-time environment. Translator.
What are the Features of an IDE that help you write your program? Editor—enables code to be entered –highlight keywords and colouring code. Error diagnostics—Highlight syntax errors in the code, error messages—line number, type etc. Breakpoints to stop code at a certain point. Watch windows—check value of variables Stepping—execute program line by line
When would it be an advantage to program in low level code. The code is more efficient so less RAM will be used and less processing power. Low level code doesn't need to be translated.
How does the IDE provide error diagnostics? Tells you what line number your error is on. Underlines errors. Describes the error with the location.
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