c语言库函数开源 c语言函数库详解 pdf

c语言的库函数是谁编写的?

计算机语言和计算机操作系统是两个层面上的东西。

网站建设公司,为您提供网站建设,网站制作,网页设计及定制网站建设服务,专注于企业网站建设,高端网页制作,对成都水泥搅拌车等多个行业拥有丰富的网站建设经验的网站建设公司。专业网站设计,网站优化推广哪家好,专业成都网站推广优化,H5建站,响应式网站。

C(包括C++)是贝尔实验室开发的,其所属公司ATT公司早已倒闭,所以已经是没有爹娘的孩子,根本没有什么标准化组织。现在主要的两个C语言标准:C89和C99都是各个厂商实现各自的C,经过市场竞争以后形成的事实标准,后经ANSI(美国国家标准化委员会)认定所形成的美国标准,继而又被ISO组织采纳为事实标准。

有标准以后各个厂商按照标准修改自己的产品,有的还提供各种选项供用户选择使用何种标准(如VC++工程属性里的各种设置),以实现“源程序级兼容”。

C中各种函数,如printf函数,涉及到操作系统界面,在不同平台上的实现肯定是不一样的。stdio.h,conio.h在硬盘上都有确实的文件的,可以打开看看函数的定义,都是一些#define之类的。具体实现功能的东西在.obj,.lib这些文件里面,有部分是用汇编写的,全部都是没有源代码的。 但是其他的通用函数可能是一样的,比如C++STL,都是HP和SGI的标准版。

linux开源,开得是linux的源,当然不包括库函数。

操作系统的API,全称application programming interface,即"应用程序接口",是操作系统提供的功能,操作系统将硬件裸机包装成虚拟机,提供多种接口供用户调用。Linux、Windows的API是基于C、C++的,DOS的API是基于汇编语言的。

既然C是接近硬件的语言,只要不违反操作系统的安全性、稳定性等限制,大可以跳开API直接操作硬件。这样无异于自己编写操作系统,所以C语言如果真的有楼主所述“只用这些函数就能解决问题”这一天,那么那个时候的C语言就已经发展成为操作系统了。

什么叫开源的c语言库

开源是unix系统发展过程中产生的一个词,意思是开放源代码。

开源的C语言库,就是自己可以得到源代码的C语言库,可以不断地改进这个库中的源代码,大家共同进步,百家争鸣,有利于C语言的发展。

c语言本身是开源的吗,c语言是用什么写的?谢谢大家了

 C语言是一个由ISO组织中的ANSI制定的标准,任何个人或者组织都可以根据这个标准将其实现。现今,世界上有许多不同的C语言实现,比较著名的有:GCC、Watcom、MS C等,其中前两者是开源的,后者是闭源的。下面粘贴几个老外的回答(原回答链接)。

The C language is not a piece of software but a defined standard, so one wouldn't say that it's open-source, but rather that it's an open standard.

There are a gazillion different compilers for C however, and many of those are indeed open-source. The most notable example is GCC's C compiler, which is all under the GNU General Public License (GPL), an open-source license.

There are more options. Watcom is open-source, for instance. There is no shortage of open-source C compilers, but without a doubt the most widespread one, at least in the non-Windows world, is GCC.

For Windows, your best bet is probably Watcom or GCC by using Cygwin or MinGW.

C is a standard which specifies how C compilers should generate programs.

C itself doesn't have any source code, just like a musical note doesn't have any plastic.

Some C compilers, such as GCC, are open source.

C is just a language, and a standardised one at that, too. It pretty much is the compiler that "does all the work". Different compilers did have different dialects; before the the C99 ANSI standard, you had things like Borland C and other competing compilers, that implemented the C language in their own fantastic ways.

stdlib is just an agreed-upon collection of standard libraries that are required to be present in any ANSI C implementation.

关于C++开源与否:

与C语言类似,C++也是由ISO/ANSI制定的一个标准,所谓的“官方”并未给出确切的实现,任何组织与个人都可以根据标准自己开发一个C++编译器出来。出名的C++编译器有:GCC/G++、libc/libc++、clang(++)、 Visual studio和MS´ runtime等。也把老外的几个回答贴出来(原回答链接)。

C++ itself is only a description what the language should be,

without a definite implementation.

Anyone can make his own implementations (compiler etc, runtime library, ...)

and call it C++ if it fits to the description.

And if a implementation is open source depends on the creator.

Examples of implementation (parts):

GCC/G++, libc/libc++, clang (++ too), Visual studio and MS´ runtime...

C++ is developed by an ISO standard committee. There's also a C++ foundation that runs a web site you might want to read.

C++ itself is a language, not a specific implementation, so there's no source code available for the standard/language itself.

Some C++ implementations are open source (e.g., Gnu and Clang).

1. C++ is a code standard defined by the International Organization of Standardization (ISO). There are many different implementations of the language, but they all tend to conform to C++11. Unlike Linux or Qt, C++ is just a standard, and to use any code written in the language you'll need a compiler. The major compilers (list from Wikipedia) are LLVM Clang, GCC, Microsoft Visual C++, and the Intel C++ Compiler.

2. C++ revisions are dealt with by ISO, and are influenced primarily by the maintainers of the above four implementations.

3. Clang and GCC are both open-source, I'm sure if you poke around you can find other conforming compilers but those are the two most used.

总之,跟Java、Python和PHP这样所谓的开源语言不同,C语言与C++没有官方提供的各自确切的实现代码(库),ISO/ANSI仅仅提供了C和C++的标准。

  这些都是我从自个儿博客摘抄来的,也不见得有人看得到。


分享题目:c语言库函数开源 c语言函数库详解 pdf
标题路径:http://scyanting.com/article/ddohdgp.html