Description of Interpreter, Compiler and Assembler

2. • Assembler
• Compiler
• Interpreter

3. ASSEMBLER

4. • To convert the assembly language
into machine code.
• Translate mnemonic operation codes
to their machine language
equivalents.
• Assigning machine addresses to
symbolic labels.

5. • The assembler can also process
assembler directives.
• Assembler directives (or pseudo-
instructions) provide instructions to the
assembler itself. They are not translated
into machine instructions
• E.g.
• START (specify name and starting address for
the program).
• END (indicate the end of the source program
and (optionally) specify the first executable
instruction in the program)

6. • Programmer write a program using a
sequence of assemble instructions.
• This sequence of assembler instructions,
known as the source code/source
program, then specified to the assembler
program when that program is started.
• It translates a source code into machine
language.
• The output of the assembler program is
called the object code or object program.

7. COMPILER

8. • A program that changes source code (high-
level language) to object code which that
can be executed by a machine.
• Compiler:
o Checks syntax of program
o Checks at a time all the program
• Primary reason for compiling source code is
to create an executable program
• Examples of compiler based language:
• C, C++, JAVA

9. • Executables: Files that actually do
something by carrying out a set of
instructions.
• E.g., .exe files in Windows
• Once the executable is there, it can be
called by the user to process the given
inputs to a program and produce the desired
outputs.

10. • Some of examples of Compiler:
o Microsoft Visual Studio
o BlueJ
o Quincy 2005
• We use C++ programming language.

11. INTERPRETER

12. • A computer program that executes instructions
written in a programming language and do not
produces the executable file.
• Interpreter:
o Checks the keywords of a program
o Taking one instruction at a time and convert it into machine language
before taking upon the next instruction.
• Examples of interpreter based language:
o PHP, JavaScript, BASIC

14. • We use JavaScript language.
• JavaScript engine is specialized computer
software which interprets and executes JavaScript.
Mostly used in web browsers.

15. • Assembler = To convert the assembly language
into machine code.
• Compiler = A program that changes source code
(high-level language) to object code which that can
be executed by a machine.
• A computer program that executes instructions
written in a programming language and do not
produces the executable file.