c 语言概述（C Language Overview）.docVIP

c 语言概述（C Language Overview） Introduction I. teaching aims The chapter mainly introduces characteristics of C language, the basic structure, the basic input and output statements and C code editing, compiling, running method, requires an understanding of the features of the C language, master the basic structure of C program, master the input and output function scanf () and printf () the basic usage, familiar with C program editor, compiling, debugging and running process. Two, the main points of knowledge Features of 1.C language (1) rich data types (2) structured control statements (3) efficient target code (4) good portability The basic structure of 2.C language (1) composed of a main function main () or a main function and other functions (2) each function is enclosed with {} (3) after each statement; The use of 3. library function printf () (1) function and usage format of function printf () (2) the use of commonly used escape characters (3) the significance and use of the common format symbols The use of 4. library function scanf () (1) function and usage format of function scanf () (2) the relation between format control and input data format (3) the use of address table columns 5.C program development process (1) edit, compile, connect, and execute (2) source program, target program, executable program Three, side by side learning Section 1.1 of the C language The C language was designed by D.M.Ritchie in 1972 on the basis of the B language, mainly for writing UNIX operating systems. Portable C language compilers appeared in 1977, allowing UNIX systems written in C to be used on a variety of computers. With the extensive application of UNIX, C has been popularized and promoted, and eventually becomes one of the most widely used computer languages in the world, independent of UNIX. In 1983, the American National Standards Institute (ANSI) developed the C language standard, that is, ANSI C. The various versions of C currently popular are based on them, such as