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one。 Basic grammar

1.C# is case-sensitive, so myVar and MyVar are two different variables.

two。 Every C# executable (such as console applications, Windows applications, and Windows services) must have an entry point-Main () (M uppercase)

Public static void Main () {/ / do something}

This method is called when the program starts. This method either returns no value (void) or returns an integer (int)

two。 Variable

1. The compiler does not allow uninitialized variables to be used in expressions. If the variables are fields in a class or structure, if they are not initialized, when they are created, the default value is 0.

two。 Type inference

Type inference (type inference) uses the var keyword. The compiler can "infer" the type of a variable based on its initialization value. Var somenum = 0; even if somenum is never declared as int, the compiler can determine that as long as somenum is within its scope, it is an int. After the variable is declared and the type is inferred, the variable type cannot be changed. Once the type of the variable is determined, the strongly typed rules followed by other variable types are followed.

3. Scope of variables

The scope of a variable is the area of code that accesses the variable. As long as the scope of the variable is different parts of the program, there will be no problem.

(1)。 Scope conflict of local variables

Public static int Main () {int j = 20; for (int item0)

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