A compiler is a computer program (or set of programs) that transforms source code written in a programming language (the source language) into another computer language (the target language, often having a binary form known as object code).[1]The most common reason for wanting to transform source code is to create an executable program.
The name "compiler" is primarily used for programs that translate source code from a high-level programming language to a lower level language (e.g., assembly language or machine code). If the compiled program can run on a computer whose CPUor operating system is different from the one on which the compiler runs, the compiler is known as a cross-compiler. A program that translates from a low level language to a higher level one is a decompiler. A program that translates between high-level languages is usually called a language translator, source to source translator, or language converter. A languagerewriter is usually a program that translates the form of expressions without a change of language.
Source: WikiPedia (http://en.wikipedia.org/wiki/Compiler)
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Compiler is a program that reads a program written in one language, called source language, and translated it in to an equivalent program in another language, called target language. It reports errors detected during the translation of source code to target code.Source program can be of any programming language. Here our source program is ANSI C program. Target program can be either Assembly language code or machine code. Here we have produced 8086 Assembly level code for the given source code. The first phase of the compiler, Lexical Analyzer, is being implemented by using LEX tool provided with Linux. The second phase, Syntax Analyzer, is being implemented by using Yacc tool provided by Linux. The third phase, Semantic Analyzer, and the fourth phase, Intermediate Code Generation, are carried out as the part of action corresponding to the production rules in the parser. The intermediate code so produced is 8086 Assembly code, which is converted into an executable by using MASM.
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