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

Try It Yourself

C++

// CPP Program to Count numbers on fingers
#include <iostream>
using namespace std;

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
int main()
{
    int n;
    n = 30;
    cout << count_num_finger(n);

    return 0;
}

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# Program to Count numbers on fingers
using System;
    
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;
    Console.WriteLine(count_num_finger(n));
}
}

// This code is contributed by Princi Singh

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
?>

Output

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);

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);
    }
}

Output

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).

Program to Count numbers on fingers

#Example:2

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