Latex improve

Custom command

The custom command is $\text{LATEX}$ A very powerful function , It can greatly optimize the volume of documents .

Basic usage ：

\newcommand{
    cmd}[args][default]{
    def}

• cmd: Newly defined commands , Cannot have the same name as an existing command
• args: Number of parameters
• default: The first parameter （ Optional ）
  （ namely #1 The default value of . You can define only one parameter 、 And the parameter contains the default value of the command .）
• def: Specific definition content
  （ Parameters 1 With #1 Instead of , Parameters 2 With #2 Instead of …）

for example ：

\newcommand{
    \hh}[1]{
    \textbf{
    #1}}
--  after `\hh{}` amount to `\textbf{}`

In fact, this grammar is equivalent to C++ Medium #define

Redefine the command
If you redefine an existing command , Use \renewcommand command , Usage and newcommand identical .