void pointer

"To the programmer on the road."For a developer, the ability to develop any module in a system is the embodiment of its core value.For an architect, mastering the advantages of various languages and applying them to the system simplifies the development of the system and is the first step in its architectural career.For a development team, in the short term to develop a user satisfaction of the software system is the core competitiveness of the embodiment.Every programmer can not be complacent,

pointer to a function. This function takes an int as a parameter and returns the char type. You can use ptrfun like Int or char. The code in the second line defines the variable pfun using this new type. In this case, the variable can be used as in Form 1.In addition, function pointers can be used in C ++ classes on the Internet.// Typedef return type (Class Name: * New Type) (parameter table)Class ca{Public:Char lcfun (int A) {return ;}};CA;Typede

Void is interpreted as "empty, space, and gap" in English. In C, void is "no type" and the corresponding void * is "no type Pointer ". Void seems to have only "Comments" and restrictions on the role of the program. Of course, the "Comments" here are not for us, but for the c

type name [subscript expression];Note: "subscript expression" is not a constant expression, that is, its value does not need to be determined during compilation, but can be determined at runtime. This is a very notable feature of heap. Sometimes, when programmers do not know how much memory they can apply for, the heap becomes extremely useful.2. Release array space:Delete [] pointer variable name pointing to this array;Note: square brackets are very

];---------------------------------------Summary: As long as you know the pointer type, declaring a pointer is very simple, the heap application is slightly more complex, but know the type, it is a little cumbersome.(1) The type that the int*ptr;//pointer points to is int(2) The type that the char*ptr;//pointer points

Address: http://www.cppblog.com/vczh/archive/2013/04/27/199765.html Posted on Chen zihan (vczh) The hole in the pointer of C ++. The remaining pitfalls are left in the next article. If I was not asked in the fan group, I still don't know that someone would do this: class Base{ ...};class Derived : public Base{ ...};Base* bs = new Derived[10];delete[] bs; I would like to say that this is completely C ++ compatible with C language, and then the C la

In distinguishing these important concepts, let's first review the three values of C in the previous one, because the three values of the address is the same, so there are often rumors that they are the first element of the address. This argument is not correct. Why is it wrong to say it? First, define a pointer, assign three values to it*p=ar;*p=ar[0];*p=ar//ErrorAn error occurred in the expression *p=ar after the program was compiled , stating that

Array pointers: First look at the name "array pointer" is "pointer", it can be understood as a pointer. But there is an array in front of it, that is, it points to an array.See-"Int (*p) [Ten], we parse from an expression, because () has a high priority,so *p on behalf of P meansThe PIN, also int is modified by [10] to indicateAn array containing 10 int, so p rep

A null pointer is a special pointer value and the only pointer value that is valid for any pointer type. A pointer variable has a NULL pointer value, indicating that it was idle at the time and did not point to something meaningfu

In-depth understanding of COM (I) -- The method parameter types are cruntimeclass * and void *. I often see questions on the Forum about how to pass void * or a custom class, such as class Ca and Ca. This article describes how to pass a pointer to a custom Class Object and clarify the role of midl, so that it is not necessary. Note that the transfer of custom t

1. Array of pointers: As the name implies, arrays of pointers are pointers to the elements inside the array, and the code is as follows:#include intMainintargcConst Char*argv[]) { //Insert code here ...//printf ("Hello, world!\n"); intA=1, b=2;//define two variables first int*p[]={a,b};//the array is then defined, and the array elements are pointersprintf"%p\n"-P:0]); printf ("%p\n"-P:1]); return 0;}View Code2. Array pointers: That is, the pointer