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Difference Between Compiler and Interpreter

02 Nov 2018 8:20 am || 0

In general, computer programs are written using high-level languages that are easy to understand by humans. A computer can only follow the source code or the high-level language after it is converted into machine language with the help of a compiler or interpreter. Here, we help you take a closer look at the role of a compiler and interpreter and understand what the difference between an interpreter and compiler is?

Interpreter vs. Compiler

The differences between a compiler and interpreter are tabulated below:

Interpreter Compiler
The various steps of programming are:

1. Creation of the program.
2. There is no machine code generation or linking of files.
3. The statements in source code are executed at the time of execution, one line at a time.
The various steps of programming are:

1. Creation of the program.
2. Compiling the program to parse or analyze the statements in one go for their correctness.
3. An error is thrown in case of any incorrect statement.
4. In case the program is error-free, the compiler will translate it from source code to binary language code.
5. The different code files are linked to form an executable program termed as exe.
6. The program is executed.
Once interpreted, the programs can only run on systems having the corresponding interpreter. The program cannot be modified without reverting to the source code.
Interpreters check one line after another and so the overall time taken for interpreting the full program is more than that taken by the compiler to complete its job. As the program code has already been translated into machine language, the time taken for code execution is less. It compiles the whole program all at once and is thus faster.
An interpreter creates no target code or intermediate code. A compiler generates a target code or intermediate code.
The interpreter does not generate any object code, and so the memory required is low. The compiler generates the object code, and so it needs more memory space.
An interpreter displays errors of every single statement one after the other; this makes it easy for the user to detect errors A compiler shows all the errors concurrently. Therefore, it is not easy to recognize the errors individually.
When an error occurs in an interpreter, the translation process is paused for a specific line. Once the error gets solved, the translation process starts for the next line. In a compiler, if an error shows up in the program, the translation process is stopped. The whole program goes through the translation process again once the debugging takes place.
It is based on the Interpretation model. It is based on the language translation linking & loading model.
An Interpreter is used for interpreting programs written in Ruby, Python, Java, PHP, etc. The compiler is useful for compiling programming languages like Scala, C, C++, C#, etc.
It takes a single line of the program code as its input. The entire program forms the input for a compiler.
An interpreter is suitable for the development and program environment. A compiler is best suited for the production environment.
The interpreted machine languages support the cause of Dynamic Typing Dynamic Typing is challenging to implement as the compilers cannot predict the happenings at turn time.
The machine codes are not saved at all. The compiler stores machine language in the form of machine codes on the disk.

What is a Compiler?

A compiler is defined as a computer program that is equipped to transform the codes written in high-level programming languages into machine codes. It translates the codes understood by humans into binary codes comprising of 1 and 0 bits. The codes translated to binary or machine language are processed by the computer to carry out corresponding tasks. 

What is Compiler-Compiler vs Interpreter-stechies

Role of a Compiler

  • The compiler needs to comply with all laid down rules about the syntax of the language in which it developed. 
  • A compiler is merely a computer program. It is not capable of debugging or fixing the errors found within the program. 
  • In case there is a mistake, it becomes essential for users to make the necessary changes in the program’s syntax at the earliest- else, it will fail to compile. 
  • The Analysis Phase of the compiler checks grammar, syntax, and semantics of the code, post which the intermediate code can be generated. This phase includes the semantic analyzer, lexical analyzer, and syntax analyzer for its functionality. 
  • The Synthesis Phase is the stage in which the intermediate code is optimized. The target code is also generated in this stage that includes the code generator and code optimizer. 

What is an Interpreter?

An interpreter can be defined as an alternative for implementing programming languages and functions in the same manner as a compiler. It performs parsing, lexing, and type checking just as a compiler. It is equipped to process the syntax tree directly. An interpreter can access expressions and also execute statements from the syntax tree.

What is Interpreter-Compiler vs Interpreter-Stechies

Role of an Interpreter

  • An interpreter is used for converting the source code during runtime, one line at a time.
  • It completely translates high-level language programs into machine level language understood by the computer.
  • An interpreter allows for the modification and evaluation of programs in the execution stage. 
  • It is capable of analyzing and processing programs in comparatively faster ways. 
  • The interpreter is best used for testing a program quickly during the modification stage and helps in running it efficiently. 

Java Compiler and Interpreter 

Java is a compiled computer programming language. However, instead of compiling directly into the executable machine code, it is first compiled into a binary intermediate form referred to as JVM bytecode. After that, the bytecode is further compiled or interpreted as needed for running the program. As Java is both an interpreter and compiled programming language, it is oft-known as the compiler interpreter language. This also explains whether Java uses a compiler or interpreter – it uses both. 

Conclusion

The paras above have well-explained the definition, role, and differences between a compiler and interpreter. The explanation of compiler vs. interpreter shows that they are both designed to perform the same work. However, they tend to be different in their operational procedures. Be it an interpreter in Java or a compiler used for translating Java commands, and they have their pros and cons, various time-saving features, application areas, etc.