void pointer

Reference http://blog.csdn.net/touch_2011/article/details/6966980 1, overview pointer array: An array of pointers can be said to be "an array of pointers," first of which is an array, and secondly, "pointers "Modifies this array, meaning that all elements of this array are pointer types, and in 32-bit systems, pointers are four bytes." Array pointers: Array pointers can be said to be "pointers to arrays", f

Char *ptr; // then omit part of the code if ((int) ptr==-1 ) // wrong Place The meaning of the sentence is from void* to int conversion loss Precision, I believe see explanation some people understand,This problem only occurs on Linux with the X64 bit, because the pointer occupies 8 bytes on a 64-bit machine, and int occupies four bytes, so this problem occurs.Workaround:(long) ptr = =-1 just fine.Abo

Many people even some books on the market use void main (), in fact, this is wrong. void Main () has never been defined in C + +. C + + Father Bjarne Stroustrup explicitly in the FAQ on his home page that the definition void main () {/* ... */} is not and never has been C + +, nor ha s it even been c. (void Main () nev

As JS expressions are too long, Coffeescript has recently been used to reduce the burden. For example, when I want to fetch the first dog in the house, I must first determine whether the house object exists and then judge the house. whether the dogs exists, and finally take the house. dogs [0]. In JS, the Javascript expression needs to be written in this way. As a result, the Coffeescript has recently been used to reduce the burden. For example, when I want to fetch the first dog in the house, I

What is a null pointer constant (null pointer constant )? [6.3.2.3-3] An integer constant expression with the value 0, or such an expression cast to type void *, is called a null pointer constant. Here we will tell you: 0, 0L, '\ 0', 3-3, 0*17 (they are all "integer constant expression") and (

What is a null pointer constant (NULL pointer constant )?[6.3.2.3-3] an integer constant expression with the value 0, or such an expression cast to type void *, is called a null pointer constant.Here we will tell you: 0, 0l, '/0', 3-3, 0*17 (they are all "integer constant expression") and (

void keywordThis section describes how to declare and invoke a void method.The following example declares a method named Printgrade and calls it to print a given score.Example public class Testvoidmethod {public static void Main (string[] args) { printgrade (78.5); } public static void Printgrade (do