Question

How to shift letters in a string x times by giving an array of shifts in C#

Answer 1

using System;

/*

string = "aaa"
After Shifting the first 1 letter by 1 = "baa"
After shifting the first 2 letters by 2 = "dca"
After shifting the first 3 letters 3 = "gfd"
result = "gfd"

*/

public class Program
{
	internal static string shifLetters(string str, int[] shifts) {
		int size = shifts.Length;

		char[] arr = str.ToCharArray();

		for (int i = size - 1; i >= 0; i--) {
			if (i + 1 < size) {
				shifts[i] += shifts[i + 1];
			}
			shifts[i] = shifts[i] % 26;
			int asciicode = str[i] - 'a';
			asciicode = asciicode + shifts[i];
			if (asciicode > 25) {
				asciicode = asciicode - 26;
			}
			arr[i] = (char)('a' + asciicode);
		}

		return new string(arr);
	}

	public static void Main(string[] args)
	{
		string str = "aaa";

		int[] shifts = new int[] {1, 2, 3};

		str = shifLetters(str, shifts);

		Console.Write(str);
	}
}



/*
run:
  
gfd
  
*/

 

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