define statistician

# Define is a macro definition Command provided in C language. Its main purpose is to provide programmers with some convenience in programming and improve the program running efficiency to a certain extent, however, when learning this command, you often cannot understand the essence of the command, and there is always some confusion here. The command is misused during programming, so that the running of the program is inconsistent with the expected pu

In php, both define () and const () can define constants. So what is the difference between define () and const? many programmers do not understand this, I will introduce you In php, both define () and const () can define constants. So what is the difference between

1. Define a simple constant: Define a constant to facilitate modification. (do not add a semicolon to the end !) # Define n 1000 It is equivalent to const int n = 1000, but slightly different. Define is a simple replacement instead of a quantity. 2. Define simple functions:

1. Simple define Definition# Define maxtime1000A simple maxtime is defined. It represents 1000. If you writeIf (I The compiler replaces maxtime with 1000 before processing this code.This definition looks similar to a normal constant definition const, but it is also different, because the definition of define is more like a simple text replacement, rather than bei

Original article address: Http://blog.csdn.net/kindazrael/article/details/8108868 Objective-C: # define Usage Analysis In C, Preprocessor is a powerful tool that makes your code easier to read and modify. With preprocessing code, you can redefine a part of the code to make your code more suitable for your style. Preprocessor is processed in advance before the code is compiled. The pre-processing code starts with a pound sign.1. About #

in our previous article, we introduced the use of PHP define examples, I believe that we have a certain understanding of define, today we introduce you to the PHP constant define and the difference between const detailed! A constant is a simple identifier. This value cannot be changed during script execution (in addition to the so-called magic constants, they a

Difference between typedef and # define ------ [Badboy ], Typedef and # define are commonly used to define the alias of an identifier and a keyword, but there is a key difference between them. Typedef is part of the language compilation process; # Define is a macro Definition Statement, which is not carried out during

Label: style blog Io ar use for strong SP Div 1) # define is a pre-processing command. It is a simple replacement during compilation and pre-processing, and does not check the correctness. It does not mean that it is correct or not, possible errors are detected and reported only when the expanded source program is compiled. For example:# Define PI 3.1415926In the program: Area = pI * r will be replaced with

1.1. # define variant, that is, # ifndef, can prevent repeated references to header files# Ifdef and # define combinations are generally used in header files to prevent repeated references of multiple files to the same header file.In actual use, even if your header file is not referenced by multiple files, it is best to add it to increase program readability, portability, robustness, and so on.Its usage is

Today, we have compiled some # define usage to share with you!1. Simple define Definition#define MAXTIME 1000A simple maxtime is defined, it represents 1000, if it is written inside the programif (IThe compiler replaces the maxtime with 1000 before processing the code.Such a definition looks similar to a normal const definition, but it is also different because t

Const and define all define constants in PHP, but what are their specific differences? In fact, very simple const is used for the definition of a class member variable, once defined and cannot change its value. Define defines a global constant that can be accessed anywhere the page define cannot be defined in the class