Assembly language program is quite tough than other programming languages. A very simple assembly language program sometime gives trouble in execution. Thus complex assembly program is not easy to solve without help from expert.
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What is Assembly Language or Assembly Program?
An assembly language is a low-level programming language used for microprocessors, microcontrollers, and additional programmable devices. Symbolic representation of the machine codes and other constants are being implemented by it so as to program a given CPU architecture. This representation is typically described by the hardware manufacturer, also is based on mnemonics which indicate instructions, memory locations, processor registers and other language attributes. Thus we can say that an assembly language is specific to particular physical computer architecture. This is the main difference between assembly languages and high level languages, because mostly high level languages are portable. An assembler is a program which is used to translate assembly language statements into the particular computer's machine code. The assembler executes a more or less isomorphic translation or a one-to-one mapping from mnemonics into machine codes. Several complicated assemblers propose extra mechanisms to assist program development, manage the assembly process, plus support debugging. Especially, most modern assemblers comprise a macro facility and are known as macro assemblers.
A simple assembler translates every assembly language statement into the equivalent machine-language statement, thus at first glimpse looks like simply a minor expediency, replacing obscure machine instructions by simply remembered names. More complicated high-level assemblers offer language abstractions like:
1) Highly developed control structures
2) High-level function/procedure statements and invocations
3) High-level abstract data types which includes records/structures, classes, unions and sets
4) Provides complicated macro processing (even though accessible on common assemblers since late 1950s for IBM 700 series and since 1960's for IBM/360, among other machines)
5) Many object-oriented programming characteristics like objects, classes, abstraction, inheritance, polymorphism etc.