Program to Count numbers on fingers
Count the given numbers on your fingers and find the correct finger on which the number ends.
Examples:
Input : 17 Output :1 Input :27 Output :3
Approach: The first number starts from the thumb, second on the index finger, third on the middle finger, fourth on the ring finger, and fifth on the little finger.
- Again six comes on the ring finger and so on.
- Here we observer a pattern, 8(last number) and 2 ends up in 2nd position, 3rd or 7th on the middle finger, and so on.
- The pattern keeps repeating after every 8 numbers
- 1 to 8
- 9 to 16
- 17 to 24, and so on
C++
Java
// Java Program to Count numbers on fingers class GFG { static int count_num_finger( int n) { int r = n % 8 ; if (r == 0 ) return 2 ; if (r < 5 ) return r; else return 10 - r; } // Driver Code public static void main(String[] args) { int n; n = 30 ; System.out.println(count_num_finger(n)); } } // This code is contributed // by Mukul Singh |
Python3
def count_num_finger( n ): r = n % 8 if r = = 0 : return 2 if r < 5 : return r else : return 10 - r # Driver Code n = 30 print (count_num_finger(n)) # This code is contributed by "Sharad_Bhardwaj". |
Javascript
<script> // Javascript Program to Count numbers on fingers function count_num_finger(n) { let r = n % 8; if (r == 0) return 2; if (r < 5) return r; else return 10 - r; } let n; n = 30; document.write(count_num_finger(n)); // This code is contributed by mukesh07. </script> |
C#
PHP
<?php function count_num_finger( $n ) { $r = $n % 8; if ( $r == 2) return 0; if ( $r < 5) return $r ; else return 10 - $r ; } // Driver Code $n = 30; echo (count_num_finger( $n )); // This code is contributed // by Aman Ojha ?> |
4
Time Complexity: O(1), As we are doing only constant time operations.
Auxiliary Space: O(1), As constant extra space is used.
Asked in Paytm Campus Placement August 2017
#Example:2
C++
#include <iostream> using namespace std; // function to count fingers int countFingers( int n) { // calculate the number of full hands int full_hands = n / 10; // calculate the number of fingers used in full hands int full_fingers = full_hands * 10; // calculate the number of remaining fingers int remaining_fingers = n % 10; // calculate the total number of fingers used int total_fingers = full_fingers + remaining_fingers; // return the total number of fingers used return total_fingers; } // Driver code int main() { int n = 23; int total_fingers = countFingers(n); cout << "Total number of fingers used to count " << n << " is " << total_fingers << endl; return 0; } // This code is contributed by user_dtewbxkn77n |
Java
import java.util.*; public class Gfg { // function to count fingers public static int countFingers( int n) { // calculate the number of full hands int full_hands = n / 10 ; // calculate the number of fingers used in full hands int full_fingers = full_hands * 10 ; // calculate the number of remaining fingers int remaining_fingers = n % 10 ; // calculate the total number of fingers used int total_fingers = full_fingers + remaining_fingers; // return the total number of fingers used return total_fingers; } // Driver code public static void main(String[] args) { int n = 23 ; int total_fingers = countFingers(n); System.out.println( "Total number of fingers used to count " + n + " is " + total_fingers); } } |
Python3
# program to count numbers on fingers def count_fingers(n): # calculate the number of full hands full_hands = n / / 10 # calculate the number of fingers used in full hands full_fingers = full_hands * 10 # calculate the number of remaining fingers remaining_fingers = n % 10 # calculate the total number of fingers used total_fingers = full_fingers + remaining_fingers # return the total number of fingers used return total_fingers # example usage n = 23 total_fingers = count_fingers(n) print ( "Total number of fingers used to count" , n, "is" , total_fingers) |
Javascript
// JavaScript equivalent of the Python code // Define a function to count fingers function count_fingers(n) { // Calculate the number of full hands let full_hands = Math.floor(n / 10); // Calculate the number of fingers used in full hands let full_fingers = full_hands * 10; // Calculate the number of remaining fingers let remaining_fingers = n % 10; // Calculate the total number of fingers used let total_fingers = full_fingers + remaining_fingers; // Return the total number of fingers used return total_fingers; } // Example usage let n = 23; let total_fingers = count_fingers(n); console.log( 'Total number of fingers used to count ' +n+ ' is' + total_fingers); |
C#
using System; class Program { static int CountFingers( int n) { // calculate the number of full hands int fullHands = n / 10; // calculate the number of fingers used in full hands int fullFingers = fullHands * 10; // calculate the number of remaining fingers int remainingFingers = n % 10; // calculate the total number of fingers used int totalFingers = fullFingers + remainingFingers; // return the total number of fingers used return totalFingers; } static void Main( string [] args) { int n = 23; int totalFingers = CountFingers(n); Console.WriteLine( "Total number of fingers used to count {0} is {1}" , n, totalFingers); } } |
Total number of fingers used to count 23 is 23
Approach:
1.Define a function count_fingers that takes an integer n as input. The function will return the total number of fingers used to count up to n.
2.Calculate the number of full hands needed to count up to n by dividing n by 10 and using integer division to round down to the nearest whole number. Assign this value to the variable full_hands.
3.Calculate the number of fingers used in the full hands by multiplying full_hands by 10. Assign this value to the variable full_fingers.
4.Calculate the number of remaining fingers needed to count up to n after using all full hands by taking the remainder of n divided by 10. 5.Assign this value to the variable remaining_fingers.
6.Calculate the total number of fingers used to count up to n by adding full_fingers and remaining_fingers. Assign this value to the variable total_fingers.
7.Return the total_fingers value.
8.In the example usage, create an integer n and call the count_fingers function with this argument. Finally, print the total number of fingers used to count up to n.
Time complexity: O(1).
Space complexity: O(1).
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