The macro in the forum. C/C ++ summarizes various compilation commands in the source code of the C program. These commands are called preprocessing commands. Although they are not actually part of the C language, they extend the C programming environment. This section descri
Recently, I have been doing ACM on the timus online judge website.
First, let's take a look at timus 1114. boxes:
This question requires calculating the number of combinations of balls of the two colors in the box. We found that the sameAlgorithm, C #ProgramIt is 62 times slower than the C ++ program.
Is it true that the performance of C # applications m
Recently need to cut in C # A C + + DLL library, anyway dllimport is an error can not find the DLL file, path, function name, parameter, dllimport parameter check to confirm the error is no help, but want to use other language call try, because it is C + + DLL supposedly use C + + Try the best, this thing with masm32 d
Today, I tried a C/C + + mixed programming, and then there was the problem of the egg ache above, went to the internet to check, found that the original is the language and the pre-C + + precompiled header problems.Error: The precompiled header file comes from an earlier version of the compiler, or the precompiled header is C
Accidental Discovery Network reading channel, http://book.51cto.com/art/201202/317549.htm, very good Hope csdn also have, may already have ...Read the "Writing high-quality code-improve C + + program 150 Recommendations", summarized and summarized;This article is used to deepen memory and urge the purpose of learning.0 How C code is used in C + +such as: int func
The school will start next semester, but the witty I decided to study by myself. Borrowed two C + + books from the library, one is Bjarne Stroustrup's C + + programming language, one is the Tian Shouxia Editor-in-chief of Tsinghua University Press, "C + + Advanced program design." I would like to self-study the former, a freshman no basis, simply do not understan
0 origin of the problem
The consideration of this problem comes from the implementation of the single-instance design pattern in object-oriented design.
The standard code for the singleton pattern implementation in C + + is:
#include
int init () { printf ("init () \ n"); return 22;} int gettheonly () { static int x = init (); return x;} int main () { int only = Gettheonly (); return 0;}
In the Get instance fun
[C/C ++ school] (4) c ++ class and object/namespace/type enhancement/Three-object operator/const topic/Reference topic/function enhancement, namespace const1. Classes and objects
Member functions, member variables, and abstract encapsulation capabilities.
Calculates the area of the circle;
# Include
2. Command Space
Namespace;
//differences in ④:struct type enhancement (c + + version)#include using namespacestd;//a struct in C + + is a new type of definition declaration//default access rights for structs in C + + public, unlike classesstructteacher{//char name[20]= "millet";//Error C2536: "Teacher::teacher::name": Cannot specify an explicit initializer for an array //Error Reason:
Historical Version
C # as Microsoft 2000 later. NET platform development of the language, the development has been 17 years of history, the language itself has a wealth of characteristics, Microsoft's support for its update is also very supportive. Microsoft has submitted C # to the standard organization Ecma,c# 5.0 is currently the latest specification
Article reprinted from: http://www.cnblogs.com/huangjacky/archive/2012/05/04/2482529.html
the difference between C–kr C and ANSI C
Recently in the book "C and Pointers", the book has repeatedly mentioned Kr C,ansi C
1. colon (:) usage
(1) represents the definition of the location domain in the structure (that is, the variable occupies several bit spaces)
Typedef struct _ XXX {
Unsigned char a: 4;
Unsigned char c;
} XXX;
(2) The colon following the constructor acts as a segmentation function. It is a class-based method for assigning values to member variables. The initialization list is more suitable for the constant const type of member variables.
Struct _ XXX {
DelegatePreface: C#1 already has the concept of entrust, but its complicated usage does not arouse much attention of the developer, in the c#2, some compiler optimizations are made, and an anonymous method can be used to create a delegate. At the same time, the conversion of method groups and delegates is also supported. By the way, the covariance and contravariance of delegates are increased in the
C # Study Notes (compared with Java, C, C ++, and Python)Recently I am going to learn about Unity3D, and select C # in C # and JavaScript #. Therefore, as a preparation for learning Unity3D, you must first learn C #. It took a day
[Mac 10.7.1 Lion x64 Intel-based gcc4.2.1 xcode4.2]
Q: Explain the title.A: I vaguely remember that when I wrote A function with the absolute value of A value, it was really painful to write it to the third one. After repeating so many times, I immediately realized the significance of heavy load and STL.[Cpp]1. int abs (int n)2 .{3. return n 4 .}5.6. long abs_long (long n)7 .{8. return n 9 .}10.11. double abs_double (double n)12 .{13. return n 14 .}When I wrote the third function, I felt really
The mainstream of the mobile phone platform is many, and the main platform of the language support is similar;1, Windows system WP8 on the main support VB, C #, C + +,2, Apple system iOS support OBJECT-C, C + +3, Android system support Java, C + +So how do you choose a cross
Why do I use exceptions in C + +?Many people may know about the anomaly mechanism in C + +, which many people may not know. Many people know what is commonly used in C assert , and know that it is specified at compile time NODEBUG to ignore it.For the C language, using normal if-else is a good choice, whereas in
(1) A simple C ++ program named "c ++ Primer" in the wind color from zero to single, and "cprimer" c ++
C ++ Primer
What we learned
0. Preface
I used to take C ++ courses, but I didn't study it seriously at the time. I basically cannot use
3.4 Boolean TypeIn our daily life, we need to use a variable of type int to represent bus 216; A variable of type float is required to represent 3.5 yuan a pound of tomato, and sometimes it needs to represent a data, which is the logical state:"Have you passed the C + + exam this time?" ”"Does he really love me?" ”The "over-and-over" and "love-not-love" are all representations of a logical judgment. Compared with the bus line and the price of tomato w
fun3 () declaration is displayed, add a column in the ing table:
Name Bar | type bar | Address Bar
B: fun3 () | B: fun3 | point to B: fun3 () Definition
Member function fun2 inherited from the parent class ()
Add a column to the ing table: records the fun2 () function inherited from.
Name Bar | type bar | Address Bar
B: fun2 () | A: fun2 | point to the parent class A: fun2 () Definition
*/}
// C inherits fromClass
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