Instructions

The program in the Programming Example: Fibonacci Number does not check:

1. Whether the first number entered by the user is less than or equal to the second number and whether both the numbers are nonnegative.

2. Whether the user entered a valid value for the position of the desired number in the Fibonacci sequence.

Rewrite that program so that it checks for these things.

NOTES:

• If an invalid number is entered for case 1 above, prompt the user to enter both numbers again.

• If an invalid number is entered for case 2, prompt the user to enter a value until a valid value is entered