c語言中英文翻譯資料-文庫吧資料
2024-09-06 11:28本頁面
【正文】 iety of programming applications.Having reviewed the history and features of C, let’s now study an example C program for a basic understanding of what a C program looks like. The following program finds the factorial of the number 6./* Program to find factorial of 6 */ include define3 VALUE 6 int i, j 。 one of the goals of the standard was to make sure that most existing programs would remain valid, or, failing that, that pilers could produce warning of new behavior.For most programmers, the most important change is a new syntax for declaring and defining functions. A function declaration can now include a description of the arguments of the function。 there are no heap or garbage collection . Finally, C itself provides no input/output facilities。 and although it has been called a “system programming language” because it is useful for writing pilers and operating systems, it has been used equally well to write major programs in various fields.Many of the important ideas stem from the language BCPL, developed by Martin Richards. The influence of BCPL on C proceeded indirectly through the language B, which was written by Ken Tompson in 1970 for the first UNIX system on the DECPDP7.BCPL and B are “typeless” languages. By contrast, C provides a variety of data types. The fundamental types are characters, and integers and floating point numbers of several sizes. Additionally, there is a hierarchy of derived data types created with pointers, arrays, structures, and unions. Expressions are formed from operands。The C Programming LanguageC is a highlevel programming language developed by Dennis Ritchie and Brian Kernighan at Bell Labs in the mid1970s. Although originally designed as a systems programming language, C has proved to be a powerful and flexible language that can be used for a variety of applications, from business programs to engineering. C is a particularly popular language for personal puter programmers because it is relatively smallit requires less memory than other languages.The first major program written in C was the UNIX operating system。 and for many years, C was considered to be inextricably linked with UNIX. Now, however, C is am important language independent of UNIX. Although it is a highlevel languages, C is much closer to assembly language than are most other highlevel languages. This closeness to the underlying machine language allows C programmers to write very efficient code. The howlevel nature of C, however, can make the language difficult to use for some types of applications.Now let’s take an overview of the C programming language, both historically and technically and technically.As a
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