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Sum of digits of a given number to a given power

  • Difficulty Level : Basic
  • Last Updated : 20 Apr, 2021
Geek Week

Given a number, we need to find the sum of all the digits of a number which we get after raising the number to a specified power.
Examples: 
 

Input: number = 5, power = 4 
Output: 13
Explanation:
Raising 5 to the power 4 we get 625.
Now adding all the digits = 6 + 2 + 5


Input: number = 9, power = 5
Output: 27
Explanation:
Raising 9 to the power 5 we get 59049.
Now adding all the digits = 5 + 9 + 0 + 4 + 9

 

The approach for Python is explained. we have used pow() function to calculate the base to the power value. Then we have extracted every digit as string using str() method. Since we can’t calculate the sum of strings, we converted every string digit back to integer using int() method. Finally, we used sum() function to get the sum of all the digits. This solution will look very simple in Python but it won’t be so short in other languages. After running both the codes, one can compare the time elapsed and the memory used in both the given language i.e., Python and Java. 
Below is the implementation of above idea :
 

C++




// CPP program to illustrate the given problem
#include<bits/stdc++.h>
using namespace std;
 
int calculate(int n, int power)
{
    int sum = 0;
    int bp = (int)pow(n, power);
    while (bp != 0) {
        int d = bp % 10;
        sum += d;
        bp /= 10;
    }
    return sum;
}
 
// Driver Code
int main()
{
    int n = 5;
    int power = 4;
    cout << calculate(n, power);
}
 
// This code is contributed by Nikita Tiwari

Java




// Java program to illustrate the given problem
public class base_power {
    static int calculate(int n, int power)
    {
        int sum = 0;
        int bp = (int)Math.pow(n, power);
        while (bp != 0) {
            int d = bp % 10;
            sum += d;
            bp /= 10;
        }
        return sum;
    }
 
    // Driver Code
    public static void main(String[] args)
    {
        int n = 5;
        int power = 4;
        System.out.println(calculate(n, power));
    }
}

Python3




# Python program to illustrate the given problem
def calculate(n, power):
    return sum([int(i) for i in str(pow(n, power))])
     
# Driver Code
n = 5
power = 4
print (calculate(n, power))

C#




// C# program to find sum of digits of
// a given number to a given power
using System;
 
public class base_power
{
     
    // Function to calculate sum
    static int calculate(int n, int power)
    {
        int sum = 0;
        int bp = (int)Math.Pow(n, power);
        while (bp != 0)
        {
            int d = bp % 10;
            sum += d;
            bp /= 10;
        }
        return sum;
    }
 
    // Driver Code
    public static void Main()
    {
        int n = 5;
        int power = 4;
        Console.WriteLine(calculate(n, power));
    }
}
 
// This code is contributed by vt_m.

PHP




<?php
// PHP program to illustrate
// the given problem
 
function calculate($n, $power)
{
     
    $sum = 0;
    $bp = (int)pow($n, $power);
    while ($bp != 0)
    {
        $d = $bp % 10;
        $sum += $d;
        $bp /= 10;
    }
    return $sum;
}
 
// Driver Code
$n = 5;
$power = 4;
echo(calculate($n, $power));
 
// This code is contributed by Ajit.
?>

Javascript




<script>
 
// Program to illustrate the given problem
  
   function calculate( n,  power)
{
     sum = 0;
     bp = Math.pow(n, power);
    while (bp != 0) {
         d = bp % 10;
        sum =sum+ d;
        bp = Math.floor(bp/ 10);
    }
    return sum;
}
   
// Driver Code
 
     n = 5;
     power = 4;
    document.write(calculate(n, power));
     
// This code is contributed by simranarora5sos
   
</script>

Output: 

13

This article is contributed by Chinmoy Lenka. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.
 

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