ATM machines allow 4 or 6 digit PIN codes and PIN codes cannot contain anything but exactly 4 digits or exactly 6 digits. Your task is to create a function that takes a string and returns true if the PIN is valid and false if it's not. Examples validatePIN("1234") ➞ true validatePIN("12345") ➞ false validatePIN("a234") ➞ false validatePIN("") ➞ false
ATM machines allow 4 or 6 digit PIN codes and PIN codes cannot contain anything but exactly 4 digits or exactly 6 digits. Your task is to create a function that takes a string and returns true if the PIN is valid and false if it's not. Examples validatePIN("1234") ➞ true validatePIN("12345") ➞ false validatePIN("a234") ➞ false validatePIN("") ➞ false
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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ATM machines allow 4 or 6 digit PIN codes and PIN codes cannot contain anything but exactly 4
digits or exactly 6 digits. Your task is to create a function that takes a string and returns true if the
PIN is valid and false if it's not.
Examples
validatePIN("1234") ➞ true
validatePIN("12345") ➞ false
validatePIN("a234") ➞ false
validatePIN("") ➞ false
Notes
● Some test cases contain special characters.
● Empty strings must return false.
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