Description:
Write a number with the Chinese numerals.
Syntax:
chn(x)
Note:
The function writes a number x according to the number system based on Chinese characters that correspond to numerals in spoken language.
Parameter:
| x | When no options are present or when @a and @u options work, parameter x should be an integer; When @b option works, parameter x should be float type. | 
Option:
| @a | Write the specific number with the Chinese number system in the format of billion, ten thousand, thousand, hundred, ten in order. | 
| @u | Write the specific number with upper case Chinese numerals. | 
| @b | Write the specific number using Chinese characters used for numbers on renminbi banknotes. | 
Example:
| 
 | A | 
 | 
| 1 | =chn(97) | Result:九七. | 
| 2 | =chn(-97) | Result:负九七. | 
| 3 | =chn@a(128) | Result: 一百二十八. | 
| 4 | =chn@a(-2594) | Result: 负二千五百九十四. | 
| 5 | =chn@u(128) | Result: 壹贰捌. | 
| 6 | =chn@u(-128) | Result: 负壹贰捌. | 
| 7 | =chn@b(1238.35) | Result: 一千二百三十八元三角五分. | 
| 8 | =chn@ub(100) | Result: 壹佰元整. |