PROGRAMMING:Write a function to output a decimal integer in hexadecimal form

Case development function output a decimal integer in hexadecimal form
Write function, function parameter is integer n, in the function output integer n hexadecimal form (recursive method). In the main function, input integers a and B, and output the hexadecimal form of all integers from a to B. Refer to the sample for the specific output format.
###Input example:
```in
200 210
```
###Output example:
```out
C8 C9 CA CB CC CD CE CF D0 D1 D2
```
###Input example:
```in
20000 20010
```
###Output example:
```out
4E20 4E21 4E22 4E23 4E24 4E25 4E26 4E27 4E28 4E29 4E2A
```







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