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constantsSecond, operatorArithmetic Operators+ 、-、 *,/,% (remainder operation can only be used for integer type)Relational Operators> >= == !=logical Operators！ | | (the expression whose connection is evaluated from left to right, and stops the calculation immediately after knowing that the result value is False or True )bitwise operators (only for integer operands) (to be continued ...) ）~ | ^ Type Conversions (when several operand types of an operator are different, they need to be converte

, output vectorsSeq ()# arithmetic progressionSTR ()# Each property of the data frameSummary ()# Calculates basic statistics for all columnsTable ()# computed column tableTapply () # function operations on all subsetsUnique ()# Find tick valueVector ()# spawn Vectors# environment and loading, output dataRead.table ()# Read Data fileScan ()# Read Data fileSETWD ()# Set Current working directoryWrite.table ()# output file# drawingJPEG ()# open JPG imagePlot ()# Scatter chartDev.off ()# Close pictu

Description 1.switch is clearer and more readable than if...else statements 2.python does not provide a switch statement 3.pthon uses a dictionary to implement the switch statement function, the implementation method is divided into 2 steps:A. Define a dictionary;B. Call the dictionary get () to get the corresponding expressionPython code: def add(x,y): return x+y def sub(x,y): return x-y def mul(x,y): return x*y def div(x,y): return x/y operation={

1. Statements are executed on a line-by-row basis, unless you do not writeIf the statement uses an if statement, his execution is jumping, and the IF statement is the process control2. Automatic boundary detection of blocks and statementsBecause Python does not have curly braces for these bounding symbols, it uses code indentation to control boundariesSimilarly, the end of a statement is not using semicolons, but also using code indentationIn the above example, for the indentation before the for

role: This function is mainly for the purpose of serialization objects. Maybe some people are allergic to the word serialization, my understanding is very simple. This means converting the type of the object to a string type (or, more specifically, the JSON type). It's so simple. For example, you have a class, so you can convert it to the corresponding JSON type by this method. It's simple.Then look.Syntax:Json.stringify (value [, Replacer] [, space])Value: is the required field. Is the object y

C Language Grammar

1029 understanding of C language Grammar

add a withxxx,xxx is the first parameter infix)Then I must declare this: Func Processdata2withparamaa (paramaa:string,paramab:string) {}Crouching trough, what a ghost!!And then call it? There is a wood in the outside of the brackets. There's no sense of paramaa inside. Processdata2withparamaa ("a""b")The OC call function is like this [self processdatawithparamaa:@ "A" paramab:@ "B"]Both sides are in brackets.This elegance your swift braces don't learn.Fortunately, the development of t

the Python standard library.1) Network application based on socket layerSockets are the bottom line of the Network Programmability section. With the socket package, we can manage the socket directly, such as assigning a socket to a port, connecting a remote port, and transferring data over a connection. We can also use the Socketserver package to build servers more easily. With multi-threaded and multi-process coordination, the establishment of multi-threaded or multi-process server, can effect

　　1 //input A, B, output a+b2 /*#include 3 int main ()4 {5 int A, b;6 scanf ("%d%d", a,b);7 printf ("%d", a+b);8 }*/9 /*Ten //Enter a character to return his ASCLL code One #include A int main () - { - char A; the scanf ("%c", a); - printf ("%d", a); - }*/ - + -#include + intMain () A { at CharA; - Charb; - while(scanf ("%c%c", a,b)!=eof)//when there is a space in the middle, the input parameters should also have a space, when there is no space, you do not have to enter a space.

1029-Understanding of C language Grammar

1014 C language Grammar definition and the derivation process of C program

1014 C language Grammar

1014 C language Grammar definition and the derivation process of C program

1014--c language Grammar definition

C Language Grammar

|1029c language Grammar

Program-External declarations, function definition function type, void|char|int|floatSpecifiers Pointers Direct specifier-Identifier sequence, Constant expressions-Parameter sequence, Parameter declarations, Compound statement, Declaring sequences-declarator initialization specifier, Initialization program-Initialize sequence Statement sequence-Statement-Expression statements, SELECT statement--Looping statements, Transfer statement-Continue|break|return|return Expressions-Assignment expressions

'} '| Struct_or_union IDENTIFIERStruct_or_union: STRUCT| UNIONStruct_declaration_list: struct_declaration| Struct_declaration_list struct_declarationStruct_declaration: Specifier_qualifier_list struct_declarator_list '; 'Specifier_qualifier_listàType_specifier specifier_qualifier_list| Type_specifier| Type_qualifier specifier_qualifier_list| Type_qualifierStruct_declarator_listàStruct_declarator| Struct_declarator_list ', ' struct_declaratorStruct_declaratorà: declarator| ': ' Constant_expressi

C Language Grammar