Implement some operations on [[wp:Variable-length quantity|variable-length quantities]], at least including conversions from a normal number in the language to the binary representation of the variable-length quantity for that number, and ''vice versa''. Any variants are acceptable.


;Task:
With above operations, 
*convert these two numbers 0x200000 (2097152 in decimal) and 0x1fffff (2097151 in decimal) into sequences of octets (an eight-bit byte); 
*display these sequences of octets;
*convert these sequences of octets back to numbers, and check that they are equal to original numbers.
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