Construct a complete C++ program from the following conditions; (Note your code should include appropriate comments)

1- User must enter "start" to start the program.

2- User are able to enter any characters and floating point number.

3- If user entered character between 'a' to 'g' or number between 1 to 25.789, please display "Level 1".

4- If user entered character between 'h' to 'm' and number between 26 to 30.789, please display "Level 2".

5- If user entered other characters or other numbers, please display "Level 3".