"Definition" and "declaration" of functions are not the same thing. The definition of function refers to the establishment of function function, including specifying function name, function value type, formal parameter and its type, function body,
Man invented the programming language in order to control the machine. Computers are becoming more powerful, and programming languages are constantly being innovated. So I boldly believe that the meaning of programming language will be beyond the
One.#define是C语言中提供的宏定义命令, the main purpose is to provide programmers with certain convenience in programming, and to a certain extent, improve the efficiency of the program, but students often do not understand the nature of the command in learning,
1 OverviewUsed preprocessing commands starting. For example, include the command # include and macro definition command # define. In the source program, these commands are placed outside the function, and are generally placed before the source file.
Always thought that my C language can still, although not superb, but at least more familiar with it. But a while ago read a tweet, and then Baidu a bit of C language is not the exact type. Found me. C language is not completely type and the use of
compiler compiles a program, it compiles only one source file and generates the corresponding intermediate file (for the VC, the. obj file), and then the connector unifies all intermediate files to form an executable file. The problem is that when
The Declaration tells the compiler some information to assist the compiler in syntax analysis and avoid compiler errors. The definition is to tell the compiler to generate some code that will be used by the connector. That is, the Declaration is for
I. Compiled and interpreted typeWe first look at the compiler type, in fact, it is the same as the assembly language: There is a translation program to convert our source code, generate the corresponding executable code. This process is a bit more
Introduction to preprocessing Directives
One, macro definition without parameters
Second, macro definition with parameters
Description: This C language topic is the prelude to learning iOS development. And for
As a developer, we really need to learn so many new programming languages. The choices we have now are quite rich, with command languages, functional languages, object-oriented languages, dynamic languages, compiled languages, interpreted languages,
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