Compilation, Interpretation & Subroutines

Question 1

What kind of compilation & interpretation is there?

Answer 1

• Levels of Programming Languages
• High Level to Low Level Translation
• High Level Program Execution
• Compilation vs. Interpretation
• Combined Compilation & Interpretation
• Compilation and Execution on Virtual Machines

Question 2

What kind of levels of programming languages are there?

Answer 2

High and low level languages

Question 3

What is in the high level languages?

Answer 3

e.g. Java, C/C++/C#, Fortran, Cobol, Pascal, etc
- Easier for humans
- Close to problem
- System independent

Question 4

What is in the low level languages?

Answer 4

Machine code – instructions stored in memory (opcodes)
- Hard to read and write by humans
- Close to system
- Doesn’t reflect problem

Question 5

What is assembly code?

Answer 5

It can be written or read by humans (using mnemonics)

Question 6

How to convert High level to Low level?

Answer 6

1. To execute on a computer we must have machine code.
2. Assembly code is translated to machine code to run
   - “assembler” : does this for relocatable code.
   - “Linker” : Combines different assembled parts into a Whole
   - “Loader” : Loads into memory at a given location

Question 7

When executing a high level program, what are the 2 different ways?

Answer 7

1. “Complied” into a program in the native machine language and then run on the target machine
2. “ Interpret” and the execution is simulated within an interpreter