[Objective-C] basic concepts and common methods of dictionaries in OC (NSDictionary and NSMutableDictionary)

I. Basic concepts of dictionariesThe dictionary (NSDictionary, NSMutableDictionary) in Foundation is a data set composed of key-value pairs, just as we define words in the dictionary.Key (key) is used to find the corresponding value. key is usually

Simple string sorting

Description Enter the names and scores of 10 students on the keyboard. Sort the names of the Students in lexicographically Ascending Order and output the results (the relationship between the names and scores remains unchanged ).Input Enter 11 rows

OpenERP pop-up window prompt Summary

OpenERPPop-up Prompt window SummaryOpenERP pop-up Prompt window has three ways, details can refer to: http://www.cnblogs.com/cnshen/p/3205405.htmlhttp://shine-it.net/index.php? Topic = 2383.0 note that the following method is discussed here:

C language and functional programming 1 (wrapper function)

I. C language and functional programming model (funcitonal programming)1) the C language provides support for funcitonal programming through function pointers (function pointers can be used as parameters or return values ). 2) but it is far from

Linux Nic detection using C language-simplified code

Universal network, throughGetifaddrsIt can greatly reduce the coding workload and achieve the same effect of C-language linux Nic detection-Ultimate Edition. #include #include #include #include #include

8. Protocol Delegate proxy mode-OC

Many proxy protocols are used in iphone development and are useful in almost every project. How to perform data interaction between the proxy and the agent. (1) specific protocol usage (2) How to Implement proxy (3) how to communicate with proxy 2

Create and search Binary Trees in C Language

# Include # Include # Include # Include # Define MAXWORD 100 struct tree_node * addtree (struct tree_node *, char *); void treeprint (struct tree_node *); int getword (char *, int ); // define the binary tree

Objective-C reprinting of static methods and instance methods

  An important syntax knowledge in objective-c is summarized here. Class method, also known as static method, refers to the method modified with the static keyword. This method is a method of the class and does not belong to an instance (object) of

File Operations in C Language

A file is a collection of data stored in external memory of a computer. CalculationComputer basis? File name, correct? File OperationsC language? What do you mean? A file is considered as a sequence of characters, that is, a forward stream. The

C. Implementation of functions with uncertain number of parameters

In some cases, you can determine the number of parameters of the function as needed. Typical examples include the familiar functions printf () and scanf. So how are they implemented? The C compiler usually provides a series of macros to handle

Question 11: What is the maximum product of the four numbers online in the 20 & #215; 20 mesh?

From: http://pe.spiritzhang.com/index.php/2011-05-11-09-44-54/12-1120t20  # Include r1, c1, r2, c2, r3, c3, r4, c4; a [] [] = {,,,,,,,,,,,,,,,,,,, {,,,,,,,,,,,,,,,,,,,{,,,,,,,,,,,,,,,,,,, {,,,,,,,,,,,,,,,,,,,{,,,,,,,,,,,,,,,,,,, {,,,,,,,,,,,,,,

Pure C implementation object-oriented

#include Interface struct Class structshape* Shape( shape_getEdges(shape * shape_getArea( _Shape(shape *triangle * Triangle( bottom, triangle_getEdges(triangle * triangle_getArea(triangle * _Triangle(triangle *rectangle * Rectangle( bottom,

How to get the file size through ftell and fseek

# Include FILE * pFile = fopen (, (pFile = NULL) perror (fseek (pFile, size = pFile = printf (} First, use fseek (pfile, 0, SEEK_END) to move the current position of the file to the end of the file, and then call the ftell () function to obtain

C-language string matching function

C-language string matching function, which can be used for saving as needed: #include #include #include #include #include badShift[ goodPostfixLastPos( *pattern, _break(flag) if(flag){ break;} flag = len =

Special attribute Mechanism

The _ attribute _ mechanism is a major feature of gnu c. It can be used to set attributes of functions, variables, and data types. Next, we will give a brief introduction to the two attributes that are useful in our work. This attribute specifies

Lw_oopc (object-oriented language)

The object-oriented concept does not seem to be compatible with the C language, but what if you really want to use it? Fortunately, someone has the same idea as you and has made real things. I know more about lw_oopc and ooc. The full name of ooc

C Language Study Notes (2)

C language type conversion: 1. example: Int; A = 3.2 + 3/4.0; // first convert to double, get 0.75 // 3.2 + 0.75 = 3.95 // Because a is an integer, the final result is determined by the type of a (that is, the type on the left of the equal sign),

C Language Study Notes (3)

1. Order of function parameters: Int I = 2; Max (I, I ++ ); A. if the order is from left to right, It is max (2, 2 ); B. If the order is from right to left, it is max (3, 2 ); Write a function that is irrelevant to the order of values. 2. function

14-C macro

#include PI 3.14 MianJi(r1) PI*r1*r1 He(x,y) x+y Ji(x,y) ((x)*(y)) SIZE 10 He(x,y) x+y Ji(x,y) ((x)*(y)) Swap(x) x-('a'-'A') Max(x,y) x>y?x:y main( argc, * pi = r = printf( printf(,MianJi(r)); i =

Addition and subtraction of scores-Common Errors and defects in C Language beginner Code (10)

  #include comdiv( x, [ a[],i,j,comd,b[(gets()!=(i=,j=;i=comdiv(b[],b[=comdiv(-b[],b[,b[]/comd,b[]/]=a[]*a[]+a[]*a[]=a[]*a[=comdiv(b[],b[,b[]/comd,b[]/ comdiv( x,(x==||y== (x==||y== (x== (x>y && !(x% (!(y%(i=,j=;iy?x:y);i++(x%i==&

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