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Find the single digit sum of alphabetical values of a string

  • Last Updated : 11 Nov, 2021

Given string S of size N, the task is to find the single-digit sum by the repetitive sum of digits of the value obtained by the sum of order of all alphabets in the given string.

The order of alphabets is given by the position at which they occur in English Alaphabets.

Examples:

Input: S = “geek”
Output: 1
Explanation:
The value obtained by the sum order of alphabets is 7 + 5 + 5 + 11 = 28.
The single digit sum obtained by sum of 28 = 2 + 8 = 10 = 1 + 0 = 1.

Input: S = “GeeksforGeeks”
Output: 7

 

Approach: The given problem can be solved by first find the sum of orders of all the alphabets present in the given string S by adding the value (S[i] – ‘a’ + 1) or (S[i] – ‘A’ + 1) if S[i] is lowercase or uppercase character. After finding the value of sum, find the single digit of this value using the approach discussed in this article.

Below is the implementation of the above approach:

C++




// C++ program for the above approach
 
#include <bits/stdc++.h>
using namespace std;
 
int findTheSum(string str)
{
    string alpha;
 
    // Traverse the given string
    for (int i = 0; i < str.length(); i++) {
 
        // If character is an alphabet
        if ((str[i] >= 'A' && str[i] <= 'Z')
            || (str[i] >= 'a' && str[i] <= 'z'))
            alpha.push_back(str[i]);
    }
 
    // Stores the sum of order of values
    int score = 0, n = 0;
 
    for (int i = 0; i < alpha.length(); i++) {
 
        // Find the score
        if (alpha[i] >= 'A' && alpha[i] <= 'Z')
            score += alpha[i] - 'A' + 1;
        else
            score += alpha[i] - 'a' + 1;
    }
 
    // Find the single digit sum
    while (score > 0 || n > 9) {
        if (score == 0) {
            score = n;
            n = 0;
        }
        n += score % 10;
        score /= 10;
    }
 
    // Return the resultant sum
    return n;
}
 
// Driver Code
int main()
{
    string S = "GeeksforGeeks";
    cout << findTheSum(S);
 
    return 0;
}

Java




// Java program for the above approach
import java.util.*;
class GFG{
 
static int findTheSum(char []str)
{
    String alpha="";
 
    // Traverse the given String
    for (int i = 0; i < str.length; i++) {
 
        // If character is an alphabet
        if ((str[i] >= 'A' && str[i] <= 'Z')
            || (str[i] >= 'a' && str[i] <= 'z'))
            alpha+=(str[i]);
    }
 
    // Stores the sum of order of values
    int score = 0, n = 0;
 
    for (int i = 0; i < alpha.length(); i++) {
 
        // Find the score
        if (alpha.charAt(i) >= 'A' && alpha.charAt(i) <= 'Z')
            score += alpha.charAt(i) - 'A' + 1;
        else
            score += alpha.charAt(i) - 'a' + 1;
    }
 
    // Find the single digit sum
    while (score > 0 || n > 9) {
        if (score == 0) {
            score = n;
            n = 0;
        }
        n += score % 10;
        score /= 10;
    }
 
    // Return the resultant sum
    return n;
}
 
// Driver Code
public static void main(String[] args)
{
    String S = "GeeksforGeeks";
    System.out.print(findTheSum(S.toCharArray()));
}
}
 
// This code is contributed by 29AjayKumar

Python3




# Python program for the above approach
def findTheSum(str):
 
    alpha = ""
 
    # Traverse the given string
    for i in range(0, len(str)):
 
                # If character is an alphabet
        if ((str[i] >= 'A' and str[i] <= 'Z') or (str[i] >= 'a' and str[i] <= 'z')):
            alpha += str[i]
 
        # Stores the sum of order of values
    score = 0
    n = 0
 
    for i in range(0, len(alpha)):
 
                # Find the score
        if (alpha[i] >= 'A' and alpha[i] <= 'Z'):
            score += ord(alpha[i]) - ord('A') + 1
 
        else:
            score += ord(alpha[i]) - ord('a') + 1
 
        # Find the single digit sum
    while (score > 0 or n > 9):
        if (score == 0):
            score = n
            n = 0
 
        n += score % 10
        score = score // 10
 
        # Return the resultant sum
    return n
 
# Driver Code
if __name__ == "__main__":
 
    S = "GeeksforGeeks"
    print(findTheSum(S))
 
    # This code is contributed by rakeshsahni

C#




// C# program for the above approach
using System;
class GFG {
    static int findTheSum(string str)
    {
        string alpha = "";
 
        // Traverse the given string
        for (int i = 0; i < str.Length; i++) {
 
            // If character is an alphabet
            if ((str[i] >= 'A' && str[i] <= 'Z')
                || (str[i] >= 'a' && str[i] <= 'z'))
                alpha += (str[i]);
        }
 
        // Stores the sum of order of values
        int score = 0, n = 0;
 
        for (int i = 0; i < alpha.Length; i++) {
 
            // Find the score
            if (alpha[i] >= 'A' && alpha[i] <= 'Z')
                score += alpha[i] - 'A' + 1;
            else
                score += alpha[i] - 'a' + 1;
        }
 
        // Find the single digit sum
        while (score > 0 || n > 9) {
            if (score == 0) {
                score = n;
                n = 0;
            }
            n += score % 10;
            score /= 10;
        }
 
        // Return the resultant sum
        return n;
    }
 
    // Driver Code
    public static void Main()
    {
        string S = "GeeksforGeeks";
        Console.WriteLine(findTheSum(S));
    }
}
 
// This code is contributed by ukasp.

Javascript




<script>
// Javascript program for the above approach
 
function findTheSum(str) {
  let alpha = [];
 
  // Traverse the given string
  for (let i = 0; i < str.length; i++) {
    // If character is an alphabet
    if (
      (str[i].charCodeAt(0) >= "A".charCodeAt(0) &&
        str[i].charCodeAt(0) <= "Z".charCodeAt(0)) ||
      (str[i].charCodeAt(0) >= "a".charCodeAt(0) &&
        str[i].charCodeAt(0) <= "z".charCodeAt(0))
    )
      alpha.push(str[i]);
  }
 
  // Stores the sum of order of values
  let score = 0,
    n = 0;
 
  for (let i = 0; i < alpha.length; i++) {
    // Find the score
    if (
      alpha[i].charCodeAt(0) >= "A".charCodeAt(0) &&
      alpha[i].charCodeAt(0) <= "Z".charCodeAt(0)
    )
      score += alpha[i].charCodeAt(0) - "A".charCodeAt(0) + 1;
    else score += alpha[i].charCodeAt(0) - "a".charCodeAt(0) + 1;
  }
 
  // Find the single digit sum
  while (score > 0 || n > 9) {
    if (score == 0) {
      score = n;
      n = 0;
    }
    n += score % 10;
    score = Math.floor(score / 10);
  }
 
  // Return the resultant sum
  return n;
}
 
// Driver Code
 
let S = "GeeksforGeeks";
document.write(findTheSum(S));
 
// This code is contributed by saurabh_jaiswal.
</script>
Output: 
7

 

Time Complexity: O(N)
Auxiliary Space: O(1)


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