C#: Create a string like 'aababcabcd' from a given string 'abcd'

Last update on June 25 2025 13:02:52 (UTC/GMT +8 hours)

Cumulative Substrings

Write a C# Sharp program to create a string like 'aababcabcd' from a given string 'abcd'.

Visual Presentation:

Sample Solution:-

C# Sharp Code:

using System;

// Namespace declaration
namespace exercises
{
    // Class declaration
    class Program
    {
        // Main method - entry point of the program
        static void Main(string[] args)
        {
            // Displaying the output of the 'test' method with different string inputs
            Console.WriteLine(test("abcd")); // Output: aababcabcd
            Console.WriteLine(test("abc"));  // Output: aababc
            Console.WriteLine(test("a"));    // Output: a
            Console.ReadLine(); // Keeping the console window open
        }

        // Method to create a new string by concatenating substrings from the input string
        public static string test(string str)
        {
            var result = string.Empty; // Variable to store the resulting string

            // Loop through the characters of the input string
            for (var i = 0; i < str.Length; i++)
            {
                // Concatenate substrings of the input string from index 0 to 'i'
                result += str.Substring(0, i + 1);
            }

            return result; // Return the concatenated string
        }
    }
}

Sample Output:

aababcabcd
aababc
a

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C# program to generate a string where each character is repeated according to its position index in the original string.
• Write a C# program to build a string in the form of "a-bc-def-ghij" from a given string.
• Write a C# program to construct a cumulative string with the ASCII values of characters appended at each step.
• Write a C# program to create a string like "abacabad" where each new character extends the pattern cumulatively with some skipping rule.

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