c语言总结（C language summary）.docVIP

c语言总结（C language summary） Summary of C language knowledge points C language knowledge summary 1 Constant 2 Two identifier 2 Three, variable 2 Four, expression 3 Five 、 input and output function 4 Six, C language statement 5 Seven, the basic structure of the C program 5 Eight. Select structure statement 5 If (expression) statement 1, else statement 25 The conditional operator expression 1? Expression 2: expression 36 Switch statement 6 Nine cycle structure 6 For loop statement 6 While loop statement do while loop statement 6 Ten, array 7 Eleven string function 7 Twelve, function 8 Thirteen pointer 9 Fourteen, macro definition 10 Fifteen. Structure, community, enum type 10 Sixteen, the use of Turbo C 12 constant numeric constants Regular numbers: 1, 35, 2.7 Index form: 2.45e-2 equivalent to 2.45*10-2, note that e can be written in both cases, the number in front of E can not be saved, even if 1 can not be saved, the latter figure must be integer Long integer, single precision floating-point type: 3235L, 32.5F represent 3235 long integer data, 32.5 single precision floating-point type left, if not written on L, F said that 3235 is an integer, 32.5 is a double precision floating-point type, L, F size can be written character constants Common character constants: enclose a character in single quotes, such as A , @ Escape literal constants: a sequence of characters enclosed in a single quotation mark and beginning with ` ` , such as \n (carriage return), \123 (8, 123 character), \x23 (16, 23 corresponding characters) string constant Use of double quotes to enclose a sequence of characters, such as ABCef, the system stored string constants, each character is assigned a byte for byte, each character is close, and the end of the string will give another byte inside a \0 to mark the end of. symbolic constants Definition format #define symbol constant name symbol constant value, such as #define N 20 defines a symbolic constant N, its value is 20, between constant symbols and