Some basic knowledge commonly used in one of C # 's Basic articles

switch (expression)

{

case constant Expression 1: statement 1;break;

Case constant Expression 2: statement 2;break;

......

case constant Expression N: statement n;break;

Default: Statement n+1;break;

}

for (expression; expression 2; expression 3)

loop body statement;

Break statement: Interrupts the currently executing loop and jumps out of the loop.

Continue statement: Ignores the statement after continue and goes to the next loop.

The Nforeach statement is used to enumerate each element in the collection and to manipulate each element by executing a loop body. The n syntax is as follows:

foreach (data-type variable in set expression)

{

statement block;

}

Random number: Random r = new Random ();

int M=r.next (1, 100);

The concept of a class

A class is an abstract concept.

Used to describe a set of objects that have the same characteristics (data members) and the same behavior (function members)

Public: Any code can access private: Only members within the class (default) protected: The class and the derived class of the class in which it resides

Internal: In assembly

Method

A method is a member function that displays the behavior of a class or object, with the following syntax: [access modifier] Returns a value type method name ([parameter])

{

Method body

}

public int ADDXY (int x,int y) {return x+y;

}

Classification of methods

Instance method: Default Stuclass stu=new stuclass (); Stu. instance method (); n static method: Q is declared with Static, belongs to a class and cannot be associated with an instance. Call: Class. static method ();

Static methods can only invoke static members.

Some basic knowledge commonly used in one of C # 's Basic articles