C++

Create Sqlite3 database file C interface call test;No Parentdir Data Insertion InterfaceExecute SQL statement functionint Sqlite3_exec (sqlite3*,//Open the database connection object, sqlite3 *db = NULL;const char *sql,//SQL to be executedInt

mutalbe's Chinese meaning is "changeable, variable", with constant (both c++) is an antonym. We know that if the member function of a class does not change the state of the object, then this member function is generally declared as Const.

1, for some array does not guarantee its content is initialized, and vector (from STL) has this guarantee. 2. Always initialize before using the object. For built-in types without any members, it must be done manually. int x = 0; const INT * p = &x;

1. The first and most important article is to introduce it: hide. (static function, static variable all available)When multiple files are compiled at the same time, all global variables and functions that do not have a static prefix have global

There are three kinds of static functions: restricting variables or function scopes, persisting variable contents, and initializing the default to 01. A global function or variable modified by the static keyword has a file scope that is visible only

In the. h header file, only the declaration of the variable or function can exist, not the definition. That is, you can only write in the header file such as: extern int A; and void f (); These are the statements. If you write a sentence of int a,

Recently wrote a program about sockets that need to be ported from Windows to Linux. Now the useful stuff to collect and record down.1. Header filesWindows under Winsock.h or winsock2.h;Linux under Netinet/in.h (mostly here), unistd.h (Close

When it comes to sorting large data volumes (100W or more), the following three sorting methods are used: quick sort, merge sort, heap sort. At this level, other bubbles, selection, insertion sort, etc. have not been seen at all, the efficiency is

The form passing value is a kind of common problem that comes into being when learning form application, and now the method of the form passing value is summarized, the method is as follows: declaring global variable values:Declare the global

This article Reprinted from: http://blog.csdn.net/andrew_wx/article/details/6629721 This example simply shows how to use the socket class to implement connection-oriented communication.   Note: The purpose of this example is to explain the general

I. Introduction This article mainly records the performance of C # various set operations. The following mark describes the marked time. The following table compares the time of various set operations.Tag description: O (1) indicates that the time

POJ 1856 Sea Battle (DFS) In the figure, each rectangle '#' connecting block represents a ship. If one ship is adjacent to the other ship with edges or edges, the two ships are considered to have collided. If a ship has collided with each other, the

Ultraviolet A 11021-Tribles (probability) Question connection: Ultraviolet A 11021-Tribles K of them are only poll, each of which only lives for one day. before death, some new poll may be generated. The probability of I being born is P. Given m,

Va 1016-Silly Sort (Replacement + greedy) Link: Ultraviolet A 1016-Silly Sort Given a sequence with a length of n, each operation can exchange the positions of any two numbers. The cost is the sum of the two numbers, and the minimum cost is obtained

HDU 4939 Stupid Tower Defense (Greedy + dp)HDU Stupid Tower Defense Question Link There are some towers where the Red Tower can attack him. After the Green Tower can attack him, the blue tower can slow down and put the tower on 1-N to maximize the

Hdu 1693 Eat the Trees (plug dp entry)Eat the TreesTime Limit: 4000/2000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission (s): 2507 Accepted Submission (s): 1225Problem DescriptionMost of us know that in the game called

HDU 1828 & amp; POJ 1177 Picture (line segment tree + scanning line + discretization) HDU question address: HDU 1828 POJ question address: POJ 1177 This question is the sum of perimeter, and the method I use may be a little troublesome .. It is the

Hdu 4932 Miaomiao & #39; s Geometry (brute force enumeration)Miaomiao's GeometryTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others)Problem DescriptionThere are N point on X-axis. Miaomiao wowould like to cover them ALL

Application of the brackets in C ++ --- matching brackets At the beginning, I learned the data structure and wrote a classic application using the delimiter, matching the brackets. Algorithm ideas: When you input a string, press '(', '[' into the

C ++ learning notes: input, output, and files1. The concept of stream data is moved from one address in the memory to another. It is called data flow. stream operation flow is implemented through the buffer mechanism. Buffer: an area of memory-used