Small knowledge (2), small knowledge

Small knowledge (2), small knowledge

Bitwise OPERATOR:

And: & when the binary bits are both 1, the result is 1, otherwise 0. Binary calculation, by-bit comparison.

Or: | if the binary bit is 0, the result is 0. Otherwise, 1 is returned. Binary calculation, by-bit comparison.

XOR: ^ if the binary phase is the same, the result is 0. Otherwise, 1 is returned. Binary calculation, by-bit comparison.

Reverse :~ If the binary value is 0, the result is 1. Otherwise, the value is 0. One-dimensional calculation, by-bit comparison.

Left shift: <equivalent to n power of 2. Binary operation.

Right Shift:> is equivalent to n power except 2. Binary operation.

Logical operators:

Or: | if both bool values are false, the result is false. Otherwise, the result is true. Binary operation.

Non-logical :! If it is false, the result is true. Unary operation.

When both the logical and: & and bool values are true, the result is true; otherwise, false. Binary operation.

Placeholder:

Placeholders are often used when we use Console. Write/Console. WriteLine, such as Console. write ("{0}", I );

The placeholder {0} must start from scratch and be smaller than the parameter list size.

You can use Console. WriteLine ("{0} {4}", 6, 9, 9, 2, 4); in this way, output 64.

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

Ask the master to ask how to do binary output by 8 bits? For example, binary 100 is output to 00000100. You do not need to add the 0 method before string Conversion. How can this problem be solved ???

GetType ():

Obtain the type of the current instance. For example, int I = 1; Console. WriteLine (I. GetType (); output: System. Int32

GetTypeCode ():

Returns the basic TypeCode of the instance.

Var I = 1;

If (I. GetTypeCode () = TypeCode. Int32.GetTypeCode ())

{......}

Is:

Bool Value

If (I is int)

{.....}

As:

Object obj = new Object (); creates 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)

{......}