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Description
Flashcards by Ana Rodrigues, updated more than 1 year ago
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Created by Ana Rodrigues
about 6 years ago
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| Question | Answer |
| Defensive design | It ensures that: 1. the number of errors or bugs is minimised 2.the program behaves as expected in spite of unexpected user actions 3.all possible errors that could occur are identified and allowed for |
| Validation : Presence check | Presence checks ensure that data has been entered |
| Length check | Length checks ensure that a specified number of characters have been entered |
| Range check | Range checks ensure that an input falls within required range |
| Testing: Syntax errors | They are grammatical mistakes in code, which could be caused by misspelling, (prnit instead of print) or by missing colons, semi-colons or brackets. They are very difficult to spot and stop the program from working. |
| Logic errors | They cause unintended output because of the fault f the logic of the algorithm e.g. using an AND operator instead of OR operator. |
| Logic gates | AND Gate: 1+1=1 1+0=0 0+1=0 0+0=0 Both have to be 1. |
| Logic gates | OR Gate: 1+1=1 1+0=1 0+1=1 0+0=0 Only one has to be 1. |
| Logic gates | NOT gate 1=0 0=1 It is the opposite. |
| Programing languages Machine language | Processors only understand instructions written in 1s and 0s. Machine code is a low-level language. |
| Programing languages Assembly language | Each instruction is directly equivalent to one in machine code. Words called mnemonics are used to replace the command represented as strings of 1s and 0s in machine code. This is a low level language. |
| Programming languages High-level language | These are languages that resemble human languages. They use key words such as 'print', 'if', and 'then'. |
| Translators Compiler | It translates the source code into a standalone, machine code program (object code) that can be executed by the processor. |
| Translators Interpreter | It translates the high-level code line by line into machine code. It is needed each time the program is run. |
| Translators Assemblers | They translate the mnemonics of assembly language into machine code instructions. Assembly language is very similar to machine code. This one assembly language instruction for each machine language instruction. |
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