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? ? ? We all know that C source is very powerful. Our great Linux is written by C source. It is different from Java. Java is object-oriented programming, C is process-oriented, what is process-oriented and what is object-oriented programming? I think since you read this article, you must understand. Then we also know that Java needs JDK virtual machines to work. The reason why Java is very cross-platform is not its own advantage, but that JDK can be installed on different platforms. JAVA runs on JDK, so his cross-platform is very strong, so popularize common sense. Then the C source is actually the same. The C source runs on the machine, so we all know that the machine has a big characteristic, that is, it can only read the machine code, so the C source we have written cannot be directly known to him, and it can only be compiled.整个南洋东海的舰队都在他的监视之下，如此的情报优势，让他可以一万人当十万人用。　　三个家庭每天都要面对各种新的问题与困扰，彼此往来间也不可避免的产生了一些不愉快。不过只要抱持着积极乐观的心态，难题总会迎刃而解，欢乐的生活也依旧会继续。Automatic mode shooting沉迷于Instagram，自夸后排。The Way to Build Tencent Aegis SystemLiskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows: