C#: Display the lower triangular of a given matrix

C# Sharp Array: Exercise-26 with Solution

Write a program in C# Sharp to print or display the lower triangular of a given matrix.

Sample Solution:-

C# Sharp Code:

using System;

public class Exercise26
{  
    public static void Main()
    {
        int i, j, n; // Declare variables for iteration and matrix size
        int[,] arr1 = new int[10, 10]; // Declare a 2D array to store the matrix

        Console.Write("\n\nDisplay the lower triangular of a given matrix :\n");
        Console.Write("----------------------------------------------------\n");

        Console.Write("Input the size of the square matrix : ");
        n = Convert.ToInt32(Console.ReadLine()); // Input the size of the square matrix

        Console.Write("Input elements in the matrix :\n");
        for (i = 0; i < n; i++)
        {
            for (j = 0; j < n; j++)
            {
                Console.Write("element - [{0}],[{1}] : ", i, j);
                arr1[i, j] = Convert.ToInt32(Console.ReadLine()); // Input matrix elements
            }
        }  

        Console.Write("The matrix is :\n");
        for (i = 0; i < n; i++)
        {
            for (j = 0; j < n; j++)
            {
                Console.Write("{0}  ", arr1[i, j]); // Display the original matrix
            }
            Console.Write("\n");
        }

        Console.Write("\nSetting zero in lower triangular matrix\n");
        for (i = 0; i < n; i++)
        {
            Console.Write("\n");
            for (j = 0; j < n; j++)
            {
                if (i <= j)
                {
                    Console.Write("{0}  ", arr1[i, j]); // Display elements in the lower triangular part
                }
                else
                {
                    Console.Write("{0}  ", 0); // Display zeros in the upper triangular part
                }
            }
        }
        Console.Write("\n\n");
    } 
}

Sample Output:

Display the lower triangular of a given matrix :                                                              
----------------------------------------------------                                                          
Input the size of the square matrix : 3                                                                       
Input elements in the first matrix :                                                                          
element - [0],[0] : 1                                                                                         
element - [0],[1] : 2                                                                                         
element - [0],[2] : 3                                                                                         
element - [1],[0] : 4                                                                                         
element - [1],[1] : 5                                                                                         
element - [1],[2] : 6                                                                                         
element - [2],[0] : 7                                                                                         
element - [2],[1] : 8                                                                                         
element - [2],[2] : 9                                                                                         
The matrix is :                                                                                               
1  2  3                                                                                                       
4  5  6                                                                                                       
7  8  9
Setting zero in lower triangular matrix                                                                       
                                                                                                              
1  2  3                                                                                                       
0  5  6                                                                                                       
0  0  9           

Flowchart:

C# Sharp Code Editor:

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