how to get the first digit of a number

In C# I need to write a program that prints in the console application the last digit of a particular number "n". Does anyone know how to trim the first digit and the last digit off of a number in a cell using a formula? 0. Table of Contents [ hide] Next: Write a program in C++ to find the sum of first and last digit of a number. In short Pankaj is Web developer, Blogger, Learner, Tech and Music lover. So it seems like it should be the first digit 1 out of 9 times (about 11%): But no! The basic approach for this is to find the factorial of the number and then get its first digit. Edited: Stephen Cobeldick on 1 Feb 2019 Accepted Answer: madhan ravi. The above program uses the following logic to reverse the number, Extract the last digit using the modulus operator (Remainder of a number after dividing by 10) Add the last digit as the first digit in the reversed string ; Now remove the last digit from the original number dividing it with 10 (note the use of integer division operator //. var nextPostLink ="/2015/06/c-program-to-find-sum-of-first-and-last-digit-of-number.html"; Pankaj Prakash is the founder, editor and blogger at Codeforwin. So: Therefore, the last digit of 3^20 is 1. However, I use a different approach to find first or last digit.eval(ez_write_tag([[300,250],'codeforwin_org-box-4','ezslot_13',115,'0','0'])); Step by step descriptive logic to find first and last digit of a number without loop. Here we’ll see how to write C program to find a digit of a specified position in a number. The essence of the question asked by Potatoeo is this: How do I find the first and last digit of a really large number like 3^20? I was wondering how to go about finding the first digit from a number inputted into an array. A simple solution is to compute factorial of number, then find first digit in it. Random Restaurant Review: Handmade Burger, Leeds, FTL: The Problem with Unbalanced Randomness, On the Recent Blog Silence: A New Starcraft Website, Supergirl Collection Spotlight: Turner Supergirl Statue, Glassworking Spotlight: The Second Flower Marble, Masterchef US vs. Masterchef Australia: A Comparison, Collection Spotlight: Kinder Double Illusion Toys. To find the first digit, we are removing all digits of the number one by one from right to left. 0 ⋮ Vote. But, is there a way to find the first digits of a number? I came up with this method, which worked pretty well for me. Let’s see what happens when we take increasing powers of 3 mod 10: And we can stop here. enter the numbers to use: 9 45 682 120 output: the numbers are 9 4 6 and 1 To find the last x digits is easy, just calculate it mod $10^x$, but we can do something about the first ones? Method 1:You can achieve this using modulus n division operators. Required fields are marked *. How to find or get the last digit of a number in java? Save the number in your phone and look at the Viber or WhatsApp contact list. This snippet returns the first N digits of a number without converting the number to string.. Background. Putting an extra symbol on the front and back of the bar code numbers when I scan an item. You can apply the following formulas to check if the first character in a cell is a letter or number in Excel. Follow 50 views (last 30 days) Mazhar Ali on 1 Feb 2019. The improper fraction 5/4 has the first digit 5. Can anyone pls tell me what if x is an array of numbers can we seperate the 1st digit of each entry ..Like if x = [12 34 56 999 430 2] He loves to learn new techs and write programming articles especially for beginners. Given that 3^4 = 1 mod (10), we can essentially “cast out” fours from the exponent, because they result in a value of 1 mod 10. If "x" is irrational and has too much digits before decimal point, we can't access to its digits which are past decimal point. as a Software Design Engineer and manages Codeforwin. Code. For example, the first digit of the decimal.560 is 5. Recent Posts. He works at Vasudhaika Software Sols. Next, this program finds Factors of that number using a While Loop. So A, the first digit of 3^20 has to be 3. You’ll normally see these kinds of digit questions on math olympiad papers. And the poor old number 9 is the first digit only 5%of the time. We’ll start the numbering from right side. Hey guys, just wanted to first off say thanks for all the help in the past. This will find the position of the first instance of one of the elements of the array {0,1,2,3,4,5,6,7,8,9} (i.e. From the entered number, i want to extract the first digit in the number. Logic to swap first and last digit of a number in C program. Surprisingly, these two statements will help you solve problem. For example, 0-th digit of 2341238 is 8 and 3-rd digit is 1. 10^4 is 10000, so if you use // (floor division) of the number by that, you will get the integer part of 2.3456, which is 2 (the first digit of the number). How to extract 1st digit of each number in an array. Find a 10 digit number where the first digit is how many 0's in the number. For example if we have x=953, I want to select specifically the first digit (or the last two) and save it in another variable, so the outcome would be y=9 (or y=53) Thanks 0 Comments. Thank you for any help. Learn how your comment data is processed. ... n Result 21 1 139 9 4 4 In order to do that, we need to first introduce the concept of modular arithmetic. I was asked by my senior colleague to make a method which takes two arguments as input, first the number and second the number of digits to be returned from the first argument number, but the restriction was not to convert it to string. Check if first character in a cell is a letter or number with formula. A better solution is to use the fact that factorial contains trailing 0s and removing trailing 0s does not change first digit. Count the number of digits; Loop number of digits time by counting it with a variable i. So, let’s do that: We agreed that this number is between an integer A and A+1. It’s a cool trick to know, but parts of it will require a calculator. We can write this number as Axxxxxxxxx, where x’s denote other digits that we don’t care about. It returns log base 10 value of the passed parameter to log10() function. The intended solution for this problem (particularly the part about finding the first digit of the number) required the use of the divisibility rules of 3 (a number is divisible by 3 if the sum of its digits is divisible by 3). Logic to find first and last digit of a given number without using loop in C program. displayAlign: "left", Step by step description to find first digit of a number. Sign in to comment. The above solution causes overflow soon. This site uses Akismet to reduce spam. First is the number and second is the number of digits to be returned from the first argument number, but the restriction was not to convert it to the string. Vote. Try this... A1 = 1234567890 =MID(A1,2,8) Returns 23456789 as a TEXT string.--Biff In order to do this, let’s first think about what is asked of us. Here, you can enter your own customized way to format numbers. }); Add first and the last digit to the sum variable. So if the typed in number is 43, i want to extract the 4, but not the 3. Select a blank cell for placing the checking result, then enter formula into the Formula Bar, and then press the Enter key. Dr. Benford found this amazing thing also happened with baseball statistics, areas of rivers, population sizes, street addresses and many more ca… Usually this part can be done without a calculator, so that’s a fun way to impress your friends at your next part. Follow on: Facebook | Twitter | Google | Website or View all posts by Pankaj, C program to find sum of natural numbers from 1 to n. Software developer, Blogger, Learner, Music Lover... C program to find sum of first and last digit of any number, C program to swap first and last digit of any number, C program to calculate sum of digits of a given number, C program to find product of digits of a given number, C program to check whether a number is palindrome or not, Input a number from user. The second digit is the number of 1's in the number. Each row will contain odd numbers of number. So, if we looked at this number mod 10, we would have our answer. To delete nth digit from ending: Get the number and the nth digit to be deleted. The first and last number of each row will be 1 and middle column will be the row number. ex. We first start by writing that last statement in mathematical terms: Believe it or not, we’re almost done. We are doing it until the current value become less than 10. /// Those digits need removed. The function will return the first digit of cell A2. A man called Dr. Frank Benford discovered that in many cases, the number 1 is the first digit about 30% of the time. The third digit gives the number of 2's The fourth digit gives the number of 3's in the number so on until the 10th digit which gives the number of 9's in the number. ///