A little knowledge of C# (2)

Little knowledge (2)

Bit operators:

and: & When the binary bits are all 1, the result is 1, otherwise 0. Binary operations, bitwise comparison.

Or: | When the binary bits are all 0, the result is 0, otherwise 1. Binary operations, bitwise comparison.

XOR: ^ When the binary bits are the same, the result is 0, otherwise 1. Binary operations, bitwise comparison.

Inverse: ~ When binary 0 is used, the result is 1, otherwise 0. ​​​​Unary operations, bitwise comparison.

Left displacement: d560e174e91f76cbe26a8032d536f90f> Equivalent to dividing 2 to the nth power. Binary operations.

Logical operator:

Or: || When both bool values ​​are false, the result is false, otherwise true. Binary operations.

Logical negation: ! When false, the result is true. Unary operations.

Logical AND: && When both bool values ​​are true, the result is true, otherwise false. Binary operations.

Placeholder:

When we use Console.Write/Console.WriteLine, we often use placeholders, such as: Console.write("{0}",i);

Placeholder {0} must start from zero and be smaller than the parameter list size.

You can write Console.WriteLine("{0}{4}", 6,9,9,2,4); like this, and output 64.

Console.WriteLine("{0:x5}{4}", 6,9,9,2,4); Output 000064, note: x5

Please ask the master for binary press 8 How to do bit output? For example, binary 100 is output as 00000100. How to do it without adding 0 before converting string? ? ?

GetType():

Get the type of the current instance. For example, int i=1; Console.WriteLine(i.GetType()); Output: System.Int32

GetTypeCode():

Returns the base TypeCode of the instance.

var i = 1;
if(i.GetTypeCode()==TypeCode.Int32.GetTypeCode())
{……}
is：

Represents bool value

    if(i is int)
    {…..}

as:

Object obj = new Object(); Create a base class object.

Program p = obj as Program; If obj (reference) is not compatible with the Program class, the result is null.

    if(p==null)
    {……}

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