how define variable

1, can local variables and global variable duplicate? A: Yes, the local will screen the overall situation. To use a global variable, you need to use the "::" Local variables can have the same name as global variables, and when referenced within a

Program --- C language details 28 (const variable initialization, array size with const variable details, const variable and # define macro, volatile modification)Main Content: const variable initialization, array size using const variable details,

The difference between #define, const, typedef#define is not defining variables, it's just for text substitution.For example:#define PI 3.1415926float Angel;angel=30*pi/180;Then, when the program is compiled, the compiler will first "#define PI 3.141

There is a constant DATA_PATH, and a string & quot; file_name & quot; how to define a variable in the class (the constant seems to need 5.7), which indicates DATA_PATH and & quot; file_name & quot;. I can define it outside the class as follows:

This article mainly describes how to define a python variables， variablesThe concept is basically consistent with the equation variables of the junior algebra, just in the computer program, variablesNot only can it be a number, it can also be any

How do I define a const member variable in a C + + header file?------------------------------------------------------------------------------------A const member variable must be initialized in the constructor.[Email

Article Source: http://www.cnblogs.com/zplutor/See a classmate in the header file in this write:1 Static Const wchar_t* g_str1 = ... 2 Static Const wchar_t* g_str2 = ...This way of defining variables I've never seen, and it's going to go through

#一, PHP variable definition: Variables are used to store values, such as numbers, text strings or arrays, V: string/integer/double/array/object Naming rules: 1. The variable name of PHP is case-sensitive. 2. The variable name must begin with $3,

This is the author's personal summary of Liaoche's JavaScript tutorial. The function definition in JavaScript can be such a format functions name (parameter) {function body}It can also be in this formatvar 函数名 = function (参数) {function body};Keyword

In gnu c, macros can accept variable parameters, just like functions, such:# Define pr_debug (fmt, arg ...)/Printk (KERN_DEBUG fmt, # arg) Use variadic macros to transmit Variable Parameter tables You may be familiar with Using Variable Parameter