C# program to get the substring of a string

C# program to get the substring of a string:

In C#, we can use Substring method of string to get one substring. This method has two different variants. Following are these methods:

String.Substring(start)
String.Substring(start, length)

We can use both of these methods to get the substring of a string in C#.

String.Substring(start):

This method takes only one parameter, the start index for the sub-string. It returns a substring starting from the start index to the end of the given string.

It will throw one ArgumentOutOfRangeException if the start index provided is less than 0 or if it is greater than the length of the string.

Example of String.Substring(start):

Let’s take a look at the below example:

using System;

namespace Demo
{
	public class Program
	{
		public static void Main(string[] args)
		{
			string given_str = "Hello World !!";
			Console.WriteLine(given_str.Substring(3));
			Console.WriteLine(given_str.Substring(0));
			Console.WriteLine(given_str.Substring(6));
		}
	}
}

If you run this, it will give the below output:

lo World !!
Hello World !!
World !!

Here,

• The first statement returns the substring from index 3 to the end of the string.
• The second statement returns the substring from index 0 to end, i.e. the complete string.
• The third statement returns the substring from index 6 to end.

String.SubString(start, length):

This methood takes two parameters. The first one is the start index or the index in the string to start the sub-string and the second one is the length of the sub-string. For invalid start and length, it throws ArgumentOutOfRangeException.

Let’s take a look at the example below:

using System;

namespace Demo
{
	public class Program
	{
		public static void Main(string[] args)
		{
			string given_str = "Hello World !!";
			Console.WriteLine(given_str.Substring(0, 4));
			Console.WriteLine(given_str.Substring(0, 0));
			Console.WriteLine(given_str.Substring(0, 1));
		}
	}
}

This program will print the below output:

Hell

H

Here,

• The first statement is getting a sub-string from index 0 of size 4
• The second statement printed an empty string as the length is 0.
• The third statement printed H as the length is 1 and we are starting from the start of the string.

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