constants used for

Numeric Constants A numeric constant is what is commonly called a constant. In C + +, numeric constants are type-sensitive, and their types are recognized in literal form. Type of integer constant (integer)As you know in the previous section:

Calendar Constants You can replace the actual values anywhere in your code with the following constants: Constants value Description Vbcalgreg 0 It is noted that the Gregorian calendar is used.

Several Notes for using PHP constants (Be careful when using constants in PHP) and constants in php Why be careful when using constants in PHP? The Zend Framework document states that a constant contains numbers, letters, and underscores. A number

C + + data typesthe object that the computer handles is the data, and the data is in a certain form (for example, integers, floating-point numbers, characters, etc.). There are often some links between different data (for example, a number of

Constants also provide a convenient form of reading for these values, but unlike enumerations, constants are only a single value and, as their name shows, they are fixed and never changed. This is useful when you want to use a fixed value; Using

Thinkphp the use of custom constants and system constants Constants we all know is to define the amount of good one constant, in PHP the definition of the rule is define ("Constant name", "Constant value"); That is, in all the pages can go to use

In C #, the # define Preprocessor instruction cannot be used to define constants, which is usually used in C and C ++. This requires that all references to constants use the class name as the prefix, as shown in the following example. Static class

3.2.2 Constantsand variables can be used in the program to express those that may change the amount of data corresponding to, in C + +, we use constants to express those always remain unchanged data volume. In simple terms, the values, characters,

There are two ways to define constants in C #, one called Static constants (Compile-time constant) and the other is called Dynamic constants (Runtime constant). The former is defined by "const", which is defined by "ReadOnly". For static constants

3.2.2 Constantsand variables can be used in the program to express those that may change the amount of data corresponding to, in C + +, we use constants to express those always remain unchanged data volume. In simple terms, the values, characters,