Problem 2: Pin Number

A pin number is a four-digit number whose digits sum is a multiple of 10. A one check digit is usually added to the right of a three-digit number to form the four-digit pin number. For example, for the three digits number 572 we add the digit 6 to the right to form the pin number 5726 whose digits sum 5+7+2+6 is 20 which is a multiple of 10.

Write a program that prompts the user to enter a three digits number then form and print the four-digit pin number.

Note:- (Using C++)