3.2. the software development process pt2

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3.2. the software development process pt2

  1. 1. Implementation – High and Low Level Languages
  2. 2. High and Low Level Languages Programming languages are generally similar to the English language. They use words like If, Else, Repeat, While etc. These languages are known as high level languages.
  3. 3. High and Low Level Languages The computer does not understand high level languages. It understands binary codes which are referred to in programming as machine codes e.g. 10010010 01101010. These languages are known as low level languages.
  4. 4. Translators So, humans understand high level languages and Computers understand low level languages. To get our high level languages into a form that the computer understands, we need a translator. A translator converts high level language commands into low level language commands.
  5. 5. Interpreters and Compilers In order to resolve this problem, there are two ways to convert the high level language written by humans into a low level language understood by computers. These are interpreters and compilers.
  6. 6. Interpreters As the program is running, the interpreter takes one line of code at a time and translate it into a low level code. IF age > 18 THEN displayfield.text = “Left school” END IF
  7. 7. Interpreters As the program is running, the interpreter takes one line of code at a time and translate it into a low level code. 10011001 00010110 11000100 00010011 displayfield.text = “Left school” END IF
  8. 8. Interpreters As the program is running, the interpreter takes one line of code at a time and translate it into a low level code. 10011001 00010110 11000100 00010011 10010010 11110001 00000001 10011011 00110101 01111110
  9. 9. Compilers A compiler works by converting the program source code and converting it into object code before the program is run. IF age > 18 THEN displayfield.text = “Left school” END IF
  10. 10. Compilers A compiler works by converting the program source code and converting it into object code before the program is run. 10011001 00010110 11000100 00010011 10010010 11110001 00000001 10011011 00110101 01111110
  11. 11. Compilers vs Interpreters Interpreters are slower than compilers when the program is running because they have to interpret each line The interpreter needs to be in memory each time the program is run, whereas compilers do not Interpreters can make debugging a program easier because they can track errors line by line Compilers have to have programs recompiled each time the code is changed, even if the change is minor

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