Reference no: EM132382386

Question :

A just number is a positive integer that contains no odd digits (i.e. all its digits are even). For example, 846 is just since all its digits are even, but 234 is not just since contains an odd digit (3).

Write a program that prompts the user to enter a positive integer and prints the largest just number that is less than or equal to the user's input. Here are sample outputs:

Enter a positive integer: 6071

The largest just number less than or equal to 6071 is 6068.

Enter a positive integer: 896

The largest just number less than or equal to 896 is 888.

Think of how you can solve this problem efficiently, without the need to check if each integer smaller than the user's input is a just number.