Modify characters of a string by adding integer values of same-indexed characters from another given string

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Given two strings S and N of the same length, consisting of alphabetical and numeric characters respectively, the task is to generate a new string obtained by adding the integer value of each character of string N with the ASCII value of the same indexed character of string S. Finally, print the resultant string.
Note: If the sum exceeds 122, then subtract 26 from the sum and print the resultant character.

Examples:

Input: S = “sun”, N = “966”
Output: “bat”
Explanation:
ASCII value of ‘s’ = 115.
Therefore, 115 + 9 = 124 – 26 = 98. Therefore, equivalent character is’b’.
ASCII value of ‘u’ = 117.
Therefore, 117 + 6 = 123 – 26 = 97. Therefore, equivalent character is ‘a’.
ASCII value of ‘n’ = 110.
Therefore, 110 + 6 = 116. Therefore, equivalent character is ‘t’.

Input: S = “apple”, N = “12580”
Output: “brute”

Approach: Follow the steps below to solve the problem:

Traverse the string S:
- Convert the current character of string N to its equivalent integer value.
- Add the obtained integer value to the equivalent ASCII value of the current character in string S.
- If the value exceeds 122, which is the ASCII value of the last alphabet ‘z’, then subtract the value by 26.
- Update string S by replacing a current character with the character whose ASCII value is equal to the value obtained.
Print the resultant string after completing the above steps.

Below is the implementation of the above approach:

C++

// C++ program for the above approach
 
#include <bits/stdc++.h>
using namespace std;
 
// Function to modify a given string
// by adding ASCII value of characters
// from a string S to integer values of
// same indexed characters in string N
void addASCII(string S, string N)
{
    // Traverse the string
    for (int i = 0; i < S.size(); i++) {
 
        // Stores integer value of
        // character in string N
        int a = int(N[i]) - '0';
 
        // Stores ASCII value of
        // character in string S
        int b = int(S[i]) + a;
 
        // If b exceeds 122
        if (b > 122)
            b -= 26;
 
        // Replace the character
        S[i] = char(b);
    }
 
    // Print resultant string
    cout << S;
}
 
// Driver Code
int main()
{
    // Given strings
    string S = "sun", N = "966";
 
    // Function call to modify
    // string S by given operations
    addASCII(S, N);
 
    return 0;
}

Java

// Java program for the above approach
import java.util.*;
class GFG
{
 
// Function to modify a given String
// by adding ASCII value of characters
// from a String S to integer values of
// same indexed characters in String N
static void addASCII(char []S, char []N)
{
   
    // Traverse the String
    for (int i = 0; i < S.length; i++)
    {
 
        // Stores integer value of
        // character in String N
        int a = (int)(N[i]) - '0';
 
        // Stores ASCII value of
        // character in String S
        int b = (int)(S[i]) + a;
 
        // If b exceeds 122
        if (b > 122)
            b -= 26;
 
        // Replace the character
        S[i] = (char)(b);
    }
 
    // Print resultant String
    System.out.print(S);
}
 
// Driver Code
public static void main(String[] args)
{
   
    // Given Strings
    String S = "sun", N = "966";
 
    // Function call to modify
    // String S by given operations
    addASCII(S.toCharArray(), N.toCharArray());
}
}
 
// This code is contributed by shikhasingrajput.

Python3

# python 3 program for the above approach
 
# Function to modify a given string
# by adding ASCII value of characters
# from a string S to integer values of
# same indexed characters in string N
def addASCII(S, N):
 
    # Traverse the string
    for i in range(len(S)):
 
        # Stores integer value of
        # character in string N
        a = ord(N[i]) - ord('0')
 
        # Stores ASCII value of
        # character in string S
        b = ord(S[i]) + a
 
        # If b exceeds 122
        if (b > 122):
            b -= 26
 
        # Replace the character
        S = S.replace(S[i], chr(b))
 
    # Print resultant string
    print(S)
 
# Driver Code
if __name__ == "__main__":
 
    # Given strings
    S = "sun"
    N = "966"
 
    # Function call to modify
    # string S by given operations
    addASCII(S, N)
 
    # This code is contributed by ukasp.

C#

// C# program for the above approach
using System;
public class GFG
{
 
// Function to modify a given String
// by adding ASCII value of characters
// from a String S to integer values of
// same indexed characters in String N
static void addASCII(char []S, char []N)
{
   
    // Traverse the String
    for (int i = 0; i < S.Length; i++)
    {
 
        // Stores integer value of
        // character in String N
        int a = (int)(N[i]) - '0';
 
        // Stores ASCII value of
        // character in String S
        int b = (int)(S[i]) + a;
 
        // If b exceeds 122
        if (b > 122)
            b -= 26;
 
        // Replace the character
        S[i] = (char)(b);
    }
 
    // Print resultant String
    Console.Write(S);
}
 
// Driver Code
public static void Main(String[] args)
{
   
    // Given Strings
    String S = "sun", N = "966";
 
    // Function call to modify
    // String S by given operations
    addASCII(S.ToCharArray(), N.ToCharArray());
}
}
 
// This code is contributed by shikhasingrajput

Javascript

<script>
      // JavaScript program for the above approach
 
      // Function to modify a given string
      // by adding ASCII value of characters
      // from a string S to integer values of
      // same indexed characters in string N
      function addASCII(S, N) {
        var newStr = new Array(S.length);
        // Traverse the string
        for (var i = 0; i < S.length; i++) {
          // Stores integer value of
          // character in string N
          var a = N[i].charCodeAt(0) - "0".charCodeAt(0);
 
          // Stores ASCII value of
          // character in string S
          var b = S[i].charCodeAt(0) + a;
 
          // If b exceeds 122
          if (b > 122) b -= 26;
 
          // Replace the character
          newStr[i] = String.fromCharCode(b);
        }
 
        // Print resultant string
        document.write(newStr.join(""));
      }
 
      // Driver Code
      // Given strings
      var S = "sun",
        N = "966";
 
      // Function call to modify
      // string S by given operations
      addASCII(S, N);
    </script>

Output:

bat

Time Complexity: O(|S|)
Auxiliary Space: O(1)

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