C++

#region get a collection of sheet pages (sheets) in an Excel workbook02.///03.///get a collection of sheet pages (worksheets) in an Excel workbook04.///05.///excel filename and path, eg:c:\users\jk\desktop\ import Test .xls06.///sheet page Name

Floating-point types The real numbers in mathematics include not only integers, but also decimals. Decimals are represented by two data types in C #: Single precision (float) and double precision (double). The difference between them is that the

Object-Oriented Programming: Concepts of classes and objects [Description: This article is for beginners to just contact programming to see, the big guys may seem to feel very simple, don't blame] Classes (Class) Object-oriented thought comes

vc++2008 Debugging through Codetest.cpp:Defines the entry point for the console application.//#include "stdafx.h"#includeusing namespace Std;Class Observer;Class Subject{Publicvirtual void Attach (Observer *o) = 0;virtual void change () = 0;Virtual

This article is the third page of Part 2 Forwarding problems When programmers don't write highly-generalized code, C++98/03 's Lvalue,rvalue, references, and templates look perfect. Suppose you want to write a fully-generalized function outer (),

An indexer makes it easy to use a member of an array (or collection) in a class: using System; class MyClass { 　　 private float[] fs = new float[3] { 1.1f, 2.2f, 3.3f }; 　　 /* 属性 */ 　　 public int Length 　　 { 　　　　 get { return fs.Length; } 　　　　

This article attempts to describe a general overview of delegates and events in the. NET Framework environment using the C # language. I hope this article can help us to understand the concept of delegates, events, understand the use of delegates,

In the previous article, we described how classes encapsulate objects in a program. In practice, the class can encapsulate objects, structures and enumerations can encapsulate some objects, this article will focus on the structure and enumeration of

An introduction to the non-direction graph of adjacency table The non-direction graph of adjacency table refers to the graph represented by adjacency table. The above figure G1 contains "a,b,c,d,e,f,g" a total of 7 vertices, and contains "(A,c),

Introduction to Freud's algorithm Like the Dijkstra algorithm, the Freud (Floyd) algorithm is an algorithm for finding the shortest path between vertices in a given weighted graph. The algorithm is named after one of the founders, the 1978 Turing

Function Name: ECVT Function: Converts a floating-point number to a string Usage: Char ecvt (double value, int ndigit, int *decpt, int *sign); program Example: #include #include #include int main(void) { char *string; double value; int dec, sign;

Function Name: PARSFNM Features: Analyzing file names Usage: char *parsfnm (char *cmdline, struct FCB *fcbptr, int option); program Example: #include #include #include #include int main(void) { char line[80]; struct fcb blk; /* get file name */

Basic explanation Const is a C-language keyword that restricts a variable from being changed. The use of const can improve the robustness of the program to some extent, in addition, when viewing the code of others, clearly understand the role of

This problem has been examined in cases 1-2 and 1-3. Because each spanning tree of the N-vertex-free network g has exactly the n-1 edge, the problem is to select the n-1 edge in some way so that they form the minimum spanning tree of G. At least

This problem comes from example 1-2. The ship can be loaded in a step-by-step, with one container per step, and which container to consider. According to this idea, the following greedy guidelines can be used: from the remaining crates, select the

Given n dots (xi,yi) (1≤i≤n), it is required to find the two nearest points in the distance. Example 14-7 if you drill n a piece of metal on a hole of the same size, if the hole is too close, the metal may break. If the minimum distance of any two

One or three questions Before I start, I'll ask you to do three questions. (Hey, you have to get your head out of the coma first ...) Oh, who threw my eggs? ） 1. One of the questions: The procedure code is as follows: void Exchg1(int x, int y) {

1. The essence of variables in language To understand the C pointer, I think it's important to understand the storage essence of "variables" in C, so I'll start with the "variable" thing. First, understand the memory space! Take a look at the

Some programs are debugging, compatibility, in situations like platform porting, you might want to generate a different software by simply setting some parameters, which, of course, can be done with variable settings, write all the possible code,

Function Name: Cabs function: Calculate the absolute value of a complex number Usage: Double cabs (struct complex z); program Example: #include #include int main(void) { struct complex z; double val; z.x = 2.0; z.y = 1.0; val = cabs(z);