C# | Array.BinarySearch(Array, Int32, Int32, Object, IComparer) Method

C# | Finding the index of first element in the array

Last Updated : 01 Feb, 2019

GetLowerBound() Method is used to find the index of the first element of the specified dimension in the array. Syntax:

public int GetLowerBound (int dimension);

Here, dimension is a zero-based dimension of the array whose lower bound needs to be determined. Return Value: The return type of this method is System.Int32. This method returns the index of the first element of the specified dimension in the array. Exception: This method will give IndexOutOfRangeException if the value of dimension is less than zero, or equal or greater than Rank. Note:

GetLowerBound(0) returns the starting index of the first dimension of the array, and GetLowerBound(Rank - 1) returns the starting index of the last dimension of the array.
The GetLowerBound method always returns a value that indicates the index of the lower bound of the array, even if the array is empty.
This method is an O(1) operation.

Below programs illustrate the use of GetLowerBound() Method: Example 1:

CSharp

// C# program to illustrate the GetLowerBound(Int32)
// method in 1-D array
using System;

public class GFG {
    
    // Main method
    static public void Main()
    {

        // 1-D Array
        int[] value = {1, 2, 3, 4, 5, 6, 7};

        // Get the index of the first element
        // in the given Array by using 
        // GetLowerBound(Int32) method
        int myvalue = value.GetLowerBound(0);
        
        Console.WriteLine("Index: {0}", myvalue);
    }
}

Output:

Index: 0

Example 2:

CSharp

// C# program to illustrate the GetLowerBound(Int32)
// method when the array is empty
using System;

public class GFG {
    
    // Main method
    static public void Main()
    {

        // Empty 1-D Array
        int[] value = {};

        // Get the index of the first element
        // in the given Array by using 
        // GetLowerBound(Int32) method
        int myvalue = value.GetLowerBound(0);
        
        Console.WriteLine("Index: {0}", myvalue);
    }
}

Output:

Index: 0

Reference: https://docs.microsoft.com/en-us/dotnet/api/system.array.getlowerbound?view=netcore-2.1

C# | Array.BinarySearch(Array, Int32, Int32, Object, IComparer) Method

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