Shulou(Shulou.com)06/01 Report--

This article mainly introduces the C language, Java, JavaScript compilation and operation of what is, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor with you to understand.

The compiling and running mode of C language

Take C language as an example, if we want to write a program in C language, we need to first write a cpp file in C language, and then use a compiler to compile it into an executable file. Executable files are made up of binary machine code, but different machines have different CPU (different machine code) and different systems (different executable file formats), so they compile different binaries. For example, Windows compiles files like obj,lib,dll,exe, while Linux compiles files like .o, .a, .so. There is no common use between them. So a source code needs to be recompiled to get the corresponding executable file to run on different computers.

The way Java compiles and runs

Java is different from C language in that developers write java files with Java and compile them with Java compiler to get java class files (this file is also called Java bytecode file, which is similar to machine code, but the machine code runs directly on CPU, while the bytecode runs on the Java virtual machine). Then run the class file on the virtual machine of the corresponding system. Although different computers have different operating systems and different CPU, the Java virtual machines they install provide a unified interface for Java code. As long as the target machine can install the Java virtual machine, the class file of Java can run on the target machine.

The operation of interpretive languages such as JavaScript

Unlike Java, JavaScript requires the source code to be compiled and then run in the Java virtual machine, while JavaScript runs the source code directly into the JavaScript interpreter. This approach also makes JavaScript portability very strong. However, because JavaScript has not experienced compilation, the interpreter takes on extra work when running JavaScript code, resulting in inefficiency.

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