1. Const modifier ordinary variables and pointers
const modifier variable, generally have two kinds of writing:
const TYPE value;
TYPE const value;
The two types of writing are essentially the same. It means that the variable value of the
This blog from beginning to end to talk about the const some of the problems, I am programming small white, write a bad place also please point out.
1.const Constants
Unlike variables, the amount of a const modifier is a constant, the value of a
C + + classes have several types of data members: normal type, constant (const), static (static), and static Const. Here are the following ways of initializing them before and after c++11 respectively.Initialization of previous versions of
Const summary in C ++
For basic statements
1. const int r = 100; // standard const variable declaration and initialization, because the default internal connection must be initialized, its scope is this file, after checking the type, the compiler
The usage of the const keyword in C ++ is very flexible, and the use of const will greatly improve the robustness of the program. I will summarize some of my experiences as follows and hope to help you:
1. Const Basics
If the const keyword does not
There are two types of interaction between the pointer and the const qualifier: the pointer to the const object and the const pointer. It is not difficult to understand the meaning of the two types (which will be introduced soon below). However, in
Const repost Summary
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When you see the const keyword, C ++ programmers may first think of const constants. This is not a good conditioned reflection. If you only know that the constant is defined with const,
In the C ++ programming process, const can be used frequently.
It plays an immeasurable role in ensuring program security.
It is the most accurate expression in one sentence: "Small soldiers make great contributions ".
With const, mutable cannot be
One wonderful thing about const is that it allows you to specify a semantic constraint: a specific object should not be modified. The compiler will execute this constraint. It allows you to notify the compiler and other programmers that a value
Const-Modified variables are generally written in two ways:const TYPE value;TYPE const value;The two formulations are essentially the same. The meaning of this is that the const-modified variant of type ' value ' is immutable.For a non-pointer type,
A summary of the const usage in C + + classes:Let's look at an example:Class A{PublicA (int x): num (x), b(x) {} void Fun (const a& A); const modifier Function Parameters int getnum (void) const; const modifier functions that do not modify member
1. Const modifier ordinary variables and pointers
const modifier variable, generally have two kinds of writing:
const TYPE value;TYPE const value;
The two types of writing are essentially the same. It means that the variable value of the type
Reprinted from: http://blog.csdn.net/yjh0628/article/details/5830153
1 starting from const int nConst int n = 20, with the const modified NWe do not call it a variable, but a symbolic constant, which represents the number of 20. This is the role
Summary of C ++ const keywords and const keywords
Const is a qualifier of the C ++ language, which limits that a variable cannot be changed. Using const can improve the security and reliability of the program to a certain extent. In addition, while
1. Definition: A const constant type represents a "constant value variable" whose value is a variable that cannot be modified. That is, once the variable is declared as a const type, the compiler will disallow any action that attempts to modify the
1,Cin LanguageConstwith theC + +in theConstvoid Main () { const int a = ten; int *p = (int*) &a; *p =; printf ("%d", a);}Compare the above code in C and C + + to run the result:C: print ;C + + : Print 0 ;Thus, the const in C is a
I. Basic statements1. const int r = 100; // standard const variable declaration and initialization, because the default internal connection must be initialized, its scope is this file, after passing the type check, the compiler replaces it with 100
0. Articleintends to be the basic knowledge in the book at the same time the systematic collation, convenient for everyone is also convenient for themselves. Collation of knowledge as far as possible reference to book knowledge, than the online
The const keyword does not represent a constant, but "the content cannot be modified ". The variable modified by const does not necessarily have the same value. It may be changed by external conditions that cannot be detected by the compiler. Const
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