Problem $3$: Check if a Number is Between Two Values

Problem: Determine if a given number is between $10$ and $20($inclusive$).$ Take the number from the user. Do not use any built$-$in functions to achieve this logic.

Example Output:

Enter a number: $15$

The number is between $10$ and $20.$

Enter a number: $5$

The number is not between $10$ and $20.$