What is the palindromic number of 89?

89 takes an unusually large 24 iterations (the most of any number under 10,000 that is known to resolve into a palindrome) to reach the palindrome 8,188. 10,911 reaches the palindrome (28 digits) after 55 steps.

What is palindrome of a number?

A palindromic number is a number (in some base ) that is the same when written forwards or backwards, i.e., of the form. . The first few palindromic numbers are therefore are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 22, 33, 44, 55, 66, 77, 88, 99, 101, 111, 121, (OEIS A002113).

What is a 3 step palindrome?

process, reversing the digits of 110 and adding, you get 110 + 011 = 121. which is a palindrome. Numbers like this are called two-step palindromes. The number 68 is a three-step palindrome: 37.

Is Python a palindrome function?

Explanation: In the above program, first take input from the user (using input OR raw_input() method) to check for palindrome. Then using slice operation [start:end:step], check whether the string is reversed or not. Here, step value of -1 reverses a string. If yes, it prints a palindrome else, not a palindrome….

What does Casefold do in Python?

The casefold() method is an aggressive lower() method which converts strings to case folded strings for caseless matching. The casefold() method removes all case distinctions present in a string. It is used for caseless matching, i.e. ignores cases when comparing.

Is there a reverse string method in Java?

Objects of String are immutable. String class in Java does not have reverse() method, however StringBuilder class has built in reverse() method. 3. StringBuilder class do not have toCharArray() method, while String class does have toCharArray() method….

Can we compare string and StringBuilder in Java?

We can use equals() method for comparing two strings in Java since the String class overrides equals() method of the Object class, while StringBuilder doesn’t overrides equals() method of the Object class and hence equals() method cannot be used to compare two StringBuilder objects.

What is difference between string and StringBuffer?

In Java programming language, strings are treated as objects. The Java platform provides the String class to create and manipulate strings. Whereas, StringBuffer class is a thread-safe, mutable sequence of characters. A string buffer is like a String, but can be modified….

Is StringBuilder thread safe?

Differences. StringBuffer is synchronized and therefore thread-safe. StringBuilder is compatible with StringBuffer API but with no guarantee of synchronization. Because it’s not a thread-safe implementation, it is faster and it is recommended to use it in places where there’s no need for thread safety….

Why StringBuilder is not thread safe?

Because StringBuilder is not a synchronized one whereas StringBuffer is a synchronized one. When using StringBuilder in a multithreaded environment multiple threads can acess the StringBuilder object simultaneously and the output it produces can’t be predicted hence StringBuilder is not a thread safe……

Why Singleton is not thread safe?

It’s because when first used – when the singleton’s static variable is null – two or more threads attempting to use it would read its static variable as null and would make the singleton create a new instance more than once, leading to memory leak. An immutable or stateless singleton will be thread safe.

Do threads share heap?

We finally made it to threads! It is important to distinguish between these two types of process memory because each thread will have its own stack, but all the threads in a process will share the heap. Threads are sometimes called lightweight processes because they have their own stack but can access shared data….

Do threads share register values?

it says that threads of the same process share the code section, data section, and other O.S. resources, A thread does not have its own set of registers. A each thread has its own distinct set of register values that are loaded when the thread is active and saved when it becomes inactive….