PROGRAMMING:Cube class

Define the cube class box, the data members have length, width and height and are all integers, the constructor initializes the data members, the member function calculates the volume, the main function inputs length, width and height, and outputs the cube volume.
###Input format:
Enter the length, width and height of the cube, separated by a space.
###Output format:
Output volume and wrap.
###Input example:
Here is a set of inputs. For example:
```in
1 2 3
```
###Output example:
The corresponding output is given here. For example:
```out
six
```







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