"C-language learning", "C Primer Plus", chapter 1th Overview

Learning Summary

1. The C language was developed by Dennis Ritchie of Bell Labs in 1972 when designing UNIX operating systems with Ken Thompson. 's design is derived from Ken Thompson's B language. Anyway, it is the product of 70th century, the existence is reasonable.

2, because Unix&linux are based on C language development, so, C ubiquitous: games, operating systems, computer language, embedded, applications ...

3, c implementation sequence: source (. c) → compiler → target code (. obj) → linker (code base + startup code) → executable (linux default is. Out file, win is. exe)

4, C language There is no official standard, however, Brian Kernighan and Dennis Ritchie wrote the C programming language 1th Edition (1978) became the standard of everyone interface, usually become k&r C or classic C. With the development of the C language, in 1983 the United States National Standardization Organization (ANSI) established a committee (X3J11) to develop a new standard, which was formally adopted in 1989. This new standard (ANSI) defines the language and a standard C library. In 1990 the International Organization for Standardization adopted a C standard, and ISO C and ANSI C were in fact the same standard. Collectively referred to as C89 or C90. The 1994 revision began with the result of the C99 standard.

5, what is the programming invariants? That must have been "Hello world!." The

#include <stdio.h>int  main () {        printf ("hello world!\n") ;         return 0 ;}

Through this Hello world! opened the curtain of my C-language learning.

"C-language learning", "C Primer Plus", chapter 1th Overview