C#: Extract a substring from a given string

Last update on December 20 2024 12:53:12 (UTC/GMT +8 hours)

Write a program in C# Sharp to extract a substring from a given string without using the library function.

Sample Solution:-

C# Sharp Code:

using System;

// Define the exercise13 class
public class exercise13
{
    // Main method - entry point of the program
    public static void Main()
    {
        string str; // Declare a string variable to store input
        char[] arr1; // Declare a character array
        int pos, l, ln, c = 0; // Declare variables for position, length, string length, and counter

        // Prompt the user for input
        Console.Write("\n\nExtract a substring from a given string:\n");
        Console.Write("--------------------------------------------\n");

        Console.Write("Input the string : ");
        str = Console.ReadLine(); // Read the input string from the user
        ln = str.Length; // Get the length of the input string
        arr1 = str.ToCharArray(0, ln); // Convert the input string to a character array

        Console.Write("Input the position to start extraction :");
        pos = Convert.ToInt32(Console.ReadLine()); // Read the starting position for substring extraction

        Console.Write("Input the length of substring :");
        l = Convert.ToInt32(Console.ReadLine()); // Read the length of the substring to be extracted

        // Output the extracted substring
        Console.Write("The substring retrieved from the string is : ");
        while (c < l)
        {
            Console.Write(arr1[pos + c - 1]); // Output each character of the substring
            c++;
        }
        Console.Write("\n\n");
    }
}

Sample Output:

Extract a substring from a given string:                               
--------------------------------------------                           
Input the string : Welcome to w3resource.com                           
Input the position to start extraction :11                             
Input the length of substring :11                                      
The substring retrieve from the string is :  w3resource 

Flowchart:

C# Sharp Code Editor:

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