How to get the nth digit of a number in python. I tried pow(m, 1.

How to get the nth digit of a number in python. In-depth solution and explanation for LeetCode 400. 20f') 3. But, what about the 50th, 600th, or 20,000th prime number? I want to show you an efficient way to find the Nth prime number. Better than official and forum solutions. Given that nth is defined in re a 1-based count, accessing the index of a number array, which by nature is 0-based, would seem to involved a zero-based count to i < nth. Jul 12, 2025 · The space complexity of the code is O (n), where n is the length of the input string s. , 3 or '3') Oct 2, 2024 · An Armstrong number, also known as a narcissistic number, is a number that is equal to the sum of its digits raised to the power of the number of digits. This seems like it should be pretty trivial, but I am new at Python and want to do it the most Pythonic way. Sep 20, 2017 · In python as in most languages, the bit shift operator << and >> shift the number's binary representation. pi, math. Feb 20, 2015 · Here is a different way I found here --> Python pi calculation? to approximate python based on the Chudnovsky brothers formula for generating Pi which I have sightly modified for my program. 03 0. Mar 3, 2018 · Your solution isn't really "dangerous," but there is a generally better way to access the nth binary digit of a number (which should work in most languages as a bonus): bitwise operations. By this I mean so if the user inputs the string "$32" my program can take out the first character, being "$", and recognise that the user would like to convert from dollars. Step-by-step tutorial with examples. Jul 23, 2025 · Without using inbuilt methods whenever it comes down to extraction of digit straightaway modulo with 10 is the answer because it extracts out the last digit. In Python, you can try this method to print any position of a number. 12 If there is any value in the Learn how to write a Python function that calculates the nth digit of Pi without using loops. To get the last digit, as you said, just do x % 10. I have written the following code, which converts the integers to strings so I can then find for example, the first digit of every number Mar 6, 2019 · The proposed solutions using np. This article will explore the concept of Armstrong numbers, how to identify them, and provide various Python implementations using loops and functions. Jul 16, 2020 · There are multiple ways by which we can calculate the nth digit of pi by using Arctan formula and Bai Tagged with python, pi, chudnovskyalgorithm, geeksforgeeks. Below is the implementation of the above approach: Nov 3, 2021 · Goal: Obtain the square root and the nth root of any real positive number through algorithms using the five basic operations: sum, subtraction, multiplication, division and exponentiation to a natural number. Aug 6, 2024 · In Python, this can be accomplished efficiently using a combination of modulo and integer division. We'll get help from an old algorithm known as the Sieve of Eratosthenes. Jun 6, 2020 · How to return the nth digit of a number? Create a program that uses a function called digit which returns the value of the nth digit from the right of an integer argument. 0/3. Jul 12, 2025 · Given a number N. Easy examples included. def leftMostDigit(n): digits = 0 while n > 0: n /= 10 digits += 1 highestPower10 = digits - 1 return n / (10**highestPower10) Above is the method which involves Example 1: Input: n = 3 Output: 3 Example 2: Input: n = 11 Output: 0 Explanation: The 11th digit of the sequence 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, is a 0, which is part of the number 10. Jun 25, 2018 · Find PI to the Nth Digit - in python - this is intended to get an simple solution [duplicate] Asked 6 years, 11 months ago Modified 6 years, 11 months ago Viewed 2k times Jan 23, 2013 · This doesn't account for anything in the middle of the string, but it basically says that if the last number is a digit, it ends with a number. Compute nth digit of pi in Python. It takes an integer argument ‘n’ which represents the position of the digit you want to retrieve. Else, use a loop to find the nth occurrence of the substring and return its index. . Input will be given in this format: 726433 5 Output This allows us to treat all digits as a single string. Mar 2, 2024 · Problem Formulation: You’re given a sequence of numbers and you need to find the last digit of the nth entry in that sequence. Introduction In the world of Python programming, efficiently extracting and manipulating number digits is a crucial skill for developers. For example, the 5th prime number is 11, the 20th is 71. Learn how to write a Python function that retrieves the nth digit of Pi. Implementation: Sep 13, 2011 · Is it possible to calculate n complex roots of a given number using Python? I've shortly checked it, and it looks like Python gives me wrong/incomplete answers: (-27. Get the Last N Elements of a List using islice () The inbuilt islice () functions can also be used to perform this particular task. Feb 10, 2014 · If you can use mod then its easy: ((value - (value mod (2^n))) / (2^n)) mod 2 Otherwise bit 0 is (1+(-1^(value+1)))/2 - applicable for any integer value or any function that returns integer value. To get n-th bit, first lets shift value/function: shift right is (valuable - bit 0) / 2 - apply n times @WillJagy I get that the "farther out" a digit is the more time it takes to calculate it. I am wondering which one you guys think would be better for me to implement during a tech interview. To get the digit after that, do (x / 100) % 10. You would remove the last 4 digits, and then get the remaining last digit it. Step1: Create This function allows you to retrieve the nth digit of Pi using Python. Jun 4, 2015 · ASCII math doesn't seem to work in Python: 'a' + 5 DOESN'T WORK How could I quickly print out the nth letter of the alphabet without having an array of letters? My naive solution is Sep 18, 2025 · Python Project and Solution: Create a Python project to get the value of e to n number of decimal places. Hello coders!! In this section, we will learn how to find the number of digits in a number in a Python program. 0/n), but it doesn't work: OverflowError: long int too large to convert to float Any ideas? By long integer I Jan 10, 2018 · You're assuming that xi. 14159265358979311600 Compare to the true Learn how to write a Python function that retrieves the nth digit of Pi after the decimal point. If I want test whether the nth bit is set to 1, and where I count starting from the least signi Jul 23, 2025 · Pi is an irrational number having non-recurring decimal values. I'm a beginner in Python and I write code for finding Pi to the N'th digit Here is my code but when I search on github Some other codes which is not similar to mine but does the same job, so the question does my way is right or not? import math Pi = math. For example, if N Jun 22, 2022 · Asked3 years, 3 months ago Modified 3 years, 3 months ago Viewed 712 times -2 This question already has answers here: How to take the nth digit of a number in python (7 answers) You'll need to complete a few actions and gain 15 reputation points before being able to upvote. Python offers several ways to achieve this, leveraging both mathematical operations and string manipulation. com Certainly! Here's a tutorial on how to get the nth digit of a number in Python:In Python, you may come across si Apr 19, 2017 · My problem this time is that I need to find the nth digit in a list previously created. Suppose if n = 1234 then last Digit = n % 10 => 4 To find first digit of a number is little expensive than last I need a way to compute the nth root of a long integer in Python. What's reputation and how do I get it? Instead, you can save this post to reference later. Shifting it to the left will give 11010 which is 26 and shifting to the right gives 110 which is 6. e. Aug 5, 2024 · In this article, we will explore how to extract the nth digit of a number in Python 3, providing explanations of the concepts involved, examples, and related evidence. Store all primes in a vector. The islice function can be used to get the sliced list and reversed function is used to get the elements from rear end. Bits are numbered from right (Least Significant Bit) to left (Most Significant Bit). This type of problem generally occurs in competitive programming and also in web development. Method #1: Using re. get (key, default) for lists - i. For a given number N, return the element at (N-1)th index in a vector. Intuitions, example walk through, and complexity analysis. Attempts to emulate mod of a function may lead to result which also contain mod operation. If the count is less than the given nth occurrence, return -1. The function takes an input n and returns the nth digit of Pi, with a maximum of 15 decimal places. Using the count () method: Approach: Use the count () method to find the total number of occurrences of the substring in the given string. The task is to find the Nth prime number. Access the Nth Character: Since string indexing in Python is zero-based, you can access the Nth digit by using n-1. Get the code and understand the logic behind it. For example, if you want to print the 10 the position of a number, Multiply the number position by 10, it will be 100, Take modulo of the input by 100 and then divide it by 10. println (karen); } static int digit(int a, int b) { int digit = a; return digit; } } Create a program that uses a function called digit which returns the value of the nth digit from the right of an integer argument. That's unlikely, for two reasons: (1) the approximation is more likely to round than truncate (for example, if computing pi to 4 places after the decimal point I'd expect to get 3. The function converts the number to a string, calculates the index of the nth digit (adjusting for zero-based indexing), retrieves the character at that index, converts it back to an integer, and returns the nth digit. Jul 23, 2025 · The task of finding the power of a number in Python involves calculating the result of raising a base number to an exponent. If you want to access the nth digit in the binary representation, one way is to do: # The following function simply accesses the last bit Sep 13, 2019 · Let's say I have a string representing a hexadecimal value such as "0x4", binary represented as 0100. Apr 8, 2023 · Sometimes, while working with strings, we might be in a situation in which we require to get the numeric prefix of a string. So to throw away the last 4 digits, divide by Sep 18, 2025 · Python Project-1 with Solution Create a Python project to get the value of Pi to n number of decimal places. The task is to find the largest and the smallest digit of the number. 022499999999999999 Should round up to 0. May 27, 2020 · How can one check each individual number for what the first digit from the left contains? As well as continuing through the number to find the 2nd, 3rd, etc digit. Jul 11, 2025 · Many times, while working with strings we come across this issue in which we need to get all the numeric occurrences. Example Use a loop to iterate over each character in the string and check if it is a digit using the isdigit Subreddit for posting questions and asking for general advice about your python code. Trying to do Find the nth Digit of a Number & the next to last example makes no sense given everything else about the description. Once the number is a string you can access digits using indexing just like you would with a list. Jul 12, 2025 · Given a number A in decimal base, the task is to find the Nth digit from last in base B Examples: Input: A = 100, N = 3, B = 4 Output: 2 Explanation: (100) 4 = 1210 3 rd digit from last is 2 Input: A = 50, N = 3, B = 5 Output: 2 Explanation: (50) 5 = 200 3 rd digit from last is 2 Naive Approach: The basic idea is to first convert the decimal number A into base B and then extract the Nth digit In this example, the nth_digit () function takes a number and the position of the digit you want to extract. And there after iterate through the length of string, for i in range(len(S)): new = I am looking to find the nth digit of every number in a list. Let's discuss certain ways in which this problem can be solved in Python. returns 4, then 6 when called again. It performs integer division and modulo operations to isolate the desired digit. n will give you exactly the correct digits. May 23, 2020 · It seemed easier in my mind when I first thought about it. How to search desired digit in integer in Python. Examples: Input : 5 Output : 11 Input : 16 Output : 53 Input : 1049 Output : 8377 Approach: Find the prime numbers up to MAX_SIZE using Sieve of Eratosthenes. Using ** operator This is the simplest and most Pythonic way to calculate the power of a number. In [4]: s = "hello123" Here is the optimized and best way to print Fibonacci sequence: Fibonacci series in python (Time complexity:O (1)) Get the nth number in Fibonacci series in python This article covered how to create a Fibonacci series in python. Or, if the float has many decimal places, it would be OK to just get the first N decimals as integer. I want to find the index corresponding to the n'th occurrence of a substring within a s Jul 23, 2025 · loop iterates over the string, starting from the Nth position from the end and appending each character to the result. Sep 2, 2025 · Learn how to get the first digit of a number in Python using simple methods like string slicing, loops, recursion and math functions. Sep 20, 2023 · Find a specific digit in a number using Python. I'm sure there are ways to do this numerically but the easiest way I can think of to check a bunch of nth digit values and possibly iterate through them is to convert the number into a string using the str () function. For simplicity, the program just needs to return one digit at a time, i. 1415926535897932385 Using np. When modulo divided by 10 returns its last digit. Python code to search number. Aug 19, 2021 · I'm making a currency converter in python and I would like to be able to find what the first character in a string is. 53489082304804918409853091868095809846545421135498495431231" How do I find the value of the nth character in that string? Jul 12, 2025 · Given an integer N. Dec 24, 2021 · Is there a better approach to find a digit at a position in a number instead of converting it to a string, I feel what I have done doesn't seem best practice and arithmetic! tests = ( (1, -4948 For example, if I have: 12. Let's discuss certain ways in which this task can be performed. The Digit Memory Test python - Does "\d" in regex mean a digit? - Stack Overflow Decimal digit character: \d \d matches any decimal digit. Nov 25, 2022 · Given a number n and k (1 <= k <= 32), find the value of k-th bit in the binary representation of n. The value of n should be a second argument. 1415 of the sequence), and (2) there's likely to be some inaccuracy inherent in the approximation process This guide explains how to determine the number of digits in an integer or the length of a float's string representation in Python. We commonly know Pi=3. the program must print the nth Number is the number system that consist only digit with d1 and d2 input format first line contain d1 second line contain d2 third kine contain n d1 is not equal to d2 Oct 5, 2013 · System. 1111111111111000 Should round up to 0. If it equals m, that value is the root. , how can I simply get the nth element of a list, or a default value if not available? For example, giv Sep 2, 2025 · Learn 3 simple ways to get the first and last digit of a number in Python using loops, string slicing, and math functions. Expected output: Kindly provide an example for output. Here, we will discuss two methods to implement this program: Iterative Method Recursive Method Find the number of digits in a number in Python using Iterative Method Let’s discuss the algorithm of this program for a better understanding of the working of this program. In this, we use findall Given a long string such as: "fkjdlfjzgjkdsheiwqueqpwnvkasdakpp" or "0. For Example: digit (9635, 1) returns 5 and digit (9635, 3) returns 6. To get the digit after that, do (x / 10) % 10. In this article, we’ll explore how to extract any digit from an integer and provide a clear May 16, 2024 · I want to take the nth digit from an N digit number in python. Note: Input a number and the program will generate PI to the nth digit Sample Solution -1 : Python Code: Feb 15, 2012 · I am given a large integer a, and a (relatively small) integer n. A prime number is an Mar 22, 2010 · In Python, how can I simply do the equivalent of dictionary. What is Armstrong Number in Python? An Armstrong number of three digits is an integer such Jul 11, 2025 · Let's discuss certain solutions to perform this task. pi, etc only only work to double precision (~14 digits), to get higher precision you need to use multi-precision, for example the mpmath package >>> from mpmath import mp >>> mp. Calculate and Use PI in Python Below are the ways by which we can calculate and use PI in Python: Using NumPy Using math module Using Leibniz's formula Learn how to write a Python function that retrieves the nth digit of Pi. I will list teh python code for them below. For example we are given a string s=""abc123def456gh789" we need to extract all the numbers from the string so the output for the given string will become "123456789" In this article we will show different ways to extract digits from a string in Python methods like using regular expressions and basic string manipulation to get only the Jul 11, 2025 · To delete nth digit from ending: Get the number and the nth digit to be deleted. Dec 26, 2016 · I know that I can extract digits from a number from right to left by implementing something like: while (number =&gt; 10) digit = number modulo 10 number = number / 10 But is there a way to do GeeksforGeeks | A computer science portal for geeks May 14, 2020 · The format of the output can be a number or a string (e. This kind of application can come in various domains such as web application development. Jul 12, 2025 · Efficient Approach: The idea is to skip (N-1) digits of the given number in base B by dividing the number with B, (N - 1) times and then return the modulo of the current number by the B to get the N th digit from the right. To get the first digit of a number, use the `str()` class to convert the number to a string. So there are two ways that I know of to find the first (leftmost) digit of an integer. 1416, rather than the initial portion 3. Access the character at index `0`. In this article, we will see how to calculate PI with Python and also how to use PI in Python. An integer a, converting it to String, i. I managed to be able to calculate Pi, however no matter what number I type it will still generate the same amount of Pi number Extracting individual digits from a number based on their place value (ones, tens, hundreds, etc. 14 or Pi=22/7, but it is just an approximation for our ease. Similarly, if the process is carried for the number obtained after removing the digit that is already extracted will extract out the last digit from the small number. If you needed the 5th digit, of the number 123456789 which is a 5. ) is a common task in programming, often required for calculations, formatting, or algorithmic challenges. Contribute to CarloLepelaars/pi-digits development by creating an account on GitHub. Nth Digit in Python, Java, C++ and more. For example, if we have a base 2 and an exponent 3, the result is 2 3 = 8 23 = 8 . Sep 23, 2016 · I have defined a function 'index' which takes the number and the input index and outputs the digit at the desired index. How would I do this? Jul 15, 2017 · I'm trying to enter in a number and calculate pi to that digit input. If the i is equal to (n), then skip, else add the ith digit as [ new_number = (new_number * 10) + ith_digit ]. 0) produces (2. Jul 11, 2025 · We need to extract the digit from the given string. S. For instance 13 's binary representation is 1101. For Example: digit(9635, 1) returns 5 and digit(9635, 3) returns 6. This code defines a function get_nth_digit that takes two arguments: number (the input number) and n (the position of the digit to retrieve). pi) 3. Loop number of digits time by counting it with a variable i. Feb 2, 2024 · We'll discuss several ways to find the nth occurrence of a substring in a string. pi, '. However, that doesn't really relate to my question. But, finding a random prime number fast isn't trivial. pi gives the wrong result >>> format(np. Examples: Input : 12345 Output : First digit: 1 last digit : 5 Input : 98562 Output : First digit: 9 last digit : 2 To find last digit of a number, we use modulo operator %. This tutorial explores comprehensive techniques to break down numeric values, extract individual digits, and perform complex reordering operations using Python's powerful string and numeric processing capabilities. For example, if the input sequence is a geometric progression like 2, 4, 8, 16, …, and n is 3, the desired output is 8 (the Oct 28, 2017 · For all indices, i am required to remove that place's Digit. Easy, practical examples included. Solution (in Python) You can access the binary digit with index n (with the right-most digit having index 0) of any number num using the following code: digit = (num & (1 << n)) >> n If you want this data as Jan 15, 2025 · Learn how to split a number into its individual digits in Python using loops, string conversion, and mathematical methods. etc. 0j)**(1. 43564 I'd like to be able to get 43564 as an int. pi ans = int (input ("Enter the number of decimals to calculate to: ")) print (f" {pi Jan 9, 2019 · How to get specific number of digits? Python [duplicate] Asked 6 years, 6 months ago Modified 6 years, 6 months ago Viewed 4k times Oct 3, 2025 · The idea is to use binary search to find the n-th root of a number m by searching within the range from 1 to m. g. Nov 9, 2016 · Let's say I have a digit num = 3456 I would like to chose the third digit of that number (5), and then multiply that 5 by three. If it is greater, the search continues in the lower half; if smaller, in the upper half. Specifically, this article discusses how to determine the last digit for any given position n in a sequence, with n being a positive integer. findall () The regex can be used to perform this particular task. In each step, the middle value is raised to the power of n and compared to m. Jul 1, 2018 · Is there any &quot;pythonic&quot; way to do this? I am pretty sure my method is not good: sample = &quot;This is a string&quot; n = 3 # I want to iterate over every third element i = 1 for x in sam How can I round up a number to the second decimal place in Python? For example: 0. My understanding is that the BBP formula is a digit extraction formula—a formula that can be used to calculate a specific digit of pi without needing to calculate the previous digits. out. May 27, 2020 · Finding nth digit of a number in a list Asked 4 years, 10 months ago Modified 4 years, 10 months ago Viewed 339 times Download this code from https://codegive. Say my list was: [a,b,c,d,e,f,g] How would I code my program to get a certain (th) value from the list (say Think about what you would do if you couldnt just count by digits. dps = 20 # set number of digits >>> print(mp. it’s slower and less memory-efficient than slicing. The enumerate method operates on the strings, therefore the number is first converted to a string. What is the fastest way to get the nth bit (from the right) of the binary representation of a using native Python? Oct 15, 2008 · -1 two digit d1 and d2 will be passed . Apr 9, 2014 · Without using strings (except when necessary, such as with input or output) calculate the nth digit, from the left, of an integer (in base 10). This works because integer division just ignores the remainder, so you can effectively chop digits off the end of the number as needed by dividing by 10. com Certainly! Here's a tutorial on how to get the nth digit of a number in Python:In Python, you may come across si Download this code from https://codegive. ),We know how many digits there are due to using total_digits. Examples : Input : N = 2346 Output : 6 2 6 is the largest digit and 2 is smallest Input : N = 5 Output : 5 5 Approach: An efficient approach is to find all digits in the given number and find the largest and the smallest digit. Upvoting indicates when questions and answers are useful. The ** operator is internally optimized and is the preferred choice for most situations. We would like to show you a description here but the site won’t allow us. It is equivalent to the \p {Nd} regular expression pattern, which includes the standard decimal digits 0-9 as well as the decimal digits How to check if a string contains only digits in Java? Dec 13, 2023 · Given a number to find the first and last digit of a number. This python program is very easy to understand how to create a Fibonacci series. Using a Deque from the Collections Module For large strings or streaming data, the deque from the collections module provides a memory-efficient way to manage the last N characters. We have used two python functions, find() and split() and a regular expression method to find to nth occurrence of a substring. For example:, (My use-case was slightly different, I wanted to get all digits in the number. I tried pow(m, 1. So the formula is (x / (10 n-1)) % 10, where n is the digit to get. In this case, 1234 are throw away right? So computing this has a string first, frankly doubles the algorithm time with no value at all. wlf2 lm qeo6h7 rq8 ercr olhfl2 i8gv5l si9 aobslq joeng