definition and example of variable

Original: http://www.cnblogs.com/GavinDai/archive/2011/10/24/2222735.htmlWe are in the program design, always use the definition of variables and the declaration of variables, but sometimes we are not very clear about the concept, know how it is

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

Tag: color is medium tar local str local SSI GlobalDescription: Now on the market defined variables of the tutorial and books are basically stored procedures are described, but the stored procedure variables can only be used in begin...end block,

Definition and initialization of C + + struct type It is sometimes necessary to combine different types of data into an organic whole for easy user use. The data of these combinations in a whole are interrelated. For example, a student's number,

The shell supports custom variables.Defining variablesWhen defining a variable, the variable name does not have a dollar sign ($), such as: VariableName="value" Note that there can be no spaces between the variable name and the equals

A constant refers to the amount of changes that can be made to values during program execution. it is opposite to the constant we are talking about. if a constant is defined, it cannot be changed in the program. Variables can be changed. What is a

This example describes the parameter definitions and variable parameter usages of functions in Python. Share to everyone for your reference. Specific as follows: Just learn to use Python, especially when looking at some library source code, often

In fact, the variables have been used many times in the previous example. The amount of value that can be changed while the program is running is called a variable. A variable should have a name and occupy a certain storage unit in memory, where the

We are in the program design, always use the definition of variables and variable declarations, but sometimes we are not very clear about the concept, know how it is used, but do not know how to do, the following I simply put their differences are

Variables are used to store values, such as numbers, text strings, or arrays. Once a variable is set, we can use it repeatedly in the script. All the variables in PHP start with the $ symbol. The correct way to set variables in PHP is: $var