I am having difficulty with a program that takes in an integer in the range 20-98 as input. The output is a countdown starting from the integer, and stopping when both output digits are identical.

Ex: If the input is:

93 

the output is:

93 92 91 90 89 88 

Ex: If the input is:

77 

the output is:

77 

Ex: If the input is:

15 

or any value not between 20 and 98 (inclusive), the output is:

Input must be 20-98 

Use a while loop. Compare the digits; do not write a large if-else for all possible same-digit numbers (11, 22, 33, ..., 88), as that approach would be cumbersome for larger ranges.