Markdown learning basic grammar

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* Italics * 
** ** bold 
*** bold italic ***
***
---
~~ strikeout ~~    
<U> underlined </ U> 
[^ RUNOOB]: the ADS asdasd  

- first
- second
- third term

1. The first:
  - the first nested
2. Second term:
  - second nested
3. Third term: 
  - third nested

> This is a reference 
>> second layer reference
>>> third layer reference
>>>
>>>> fourth layer reference  

> Block using the list
1. First item
2. Second term
- first
- second

* The first 
  > learn not only the technical
  > is the dream
* The second item 

`Printf ()` function

 

```
#inlcude<stdio.h> 
int main(void)
{
  printf("Hello, world!");
}
```

This is a link: [Jiang Minghan blog] (https://www.cnblogs.com/jmhwsrr/) 

My blog: <https://www.cnblogs.com/jmhwsrr/>

! [Rebels icon] (https://img1.doubanio.com/view/photo/l/public/p2561876698.jpg)

<img src="https://img3.doubanio.com/view/photo/l/public/p2561876551.jpg" width="100%"> 

Left | center | right justified
: - | - | -:       
unit | units | unit
unit | units | unit

 

This formula $ E = 2 * mc $ Einstein invention.
$$
E * MC = 2
$$

```sequence
Alice->Bob: Hello Bob, how are you?
Note left of Alice: Bob thanks
Bob-->Alice: I am good thanks!
```

 

```flow
jmh=>start: Start
op=>operation: Your Operation
op1=>operation: My Operation
cond=>condition: Yes or No?
cond1=>condition: Y or N?
e=>end

jmh->op->cond
cond(yes)->op1->cond1
cond(no)->op
cond1(yes)->e
cond1(no)->op1
```

 

```mermaid
graph LR
A[Hard edge] -->B(Round edge)
 B --> C{Decision}
 C -->|One| D[Result one]
 C -->|Two| E[Result two]
```