How assembly language works?

Answer 1

In very broad terms a compiler takes input in some computer programming language and converts it to a form that can be executed by a processor.

Generally there are four main phases

1. Lexical analysis
2. Syntax analysis
3. Code generation
4. Linking

Lexical analysis takes the input and converts it to a stream of "tokens" which stand for things like reserved words, numbers or symbols from the language in which the original program was written.

Syntax analysis takes the tokens and does two things: verifies that the stream of tokens conforms to the rules of the programming language, and builds a tree structure that represents what the program is doing.

Code generation takes the tree structure and generates executable machine code (or virtual machine code for virtual machines such as Java).

Linking takes the generated code and combines it with other compiled modules and/or run-time libraries to produce a final executable file or "image".

At some stages code optimisation may be done by some compilers.

Answer 2

To the question,

It is an low level language

An assembly language is use to write programs :

1.Games

2.Operating system

3.Utility program

4.compiler/assembler/interpreter

5.Virus

6.Defragmenter

7.Device driver