C# program to illustrate upper triangular matrix

#For an upper triangular matrix, set all elements below the main diagonal to zero.

Set the following conditions −

if (i <= j)
   Console.Write(A[i, j] + "\t");
else
   Console.Write("0\t");

The above conditions will set the matrix elements below the main diagonal to 0.

Example

You can try running the following code to display an upper triangular matrix.

Live Demo

using System;
using System.Linq;
class Demo {
   static void Main() {
      int m, n, i, j;
      Console.Write("Enter number of rows and columns of the matrix ");
      m = Convert.ToInt16(Console.ReadLine());
      n = Convert.ToInt16(Console.ReadLine());
      int[,] A = new int[10, 10];
      Console.Write("Enter elements: ");
      for (i = 0; i < m; i++) {
         for (j = 0; j < n; j++) {
            A[i, j] = Convert.ToInt16(Console.ReadLine());
         }
      }
      Console.WriteLine("Upper Triangular Matrix ");
      for (i = 0; i < m; i++) {
         for (j = 0; j < n; j++) {
            Console.Write(A[i, j] + "\t");
         }
         Console.WriteLine();
      }
      for (i = 0; i < m; i++) {
         Console.Write("");
         for (j = 0; j < 3; j++) {
            if (i >= j)
               Console.Write(A[i, j] + "\t");
            else
               Console.Write("0\t");
         }
      }
      Console.ReadLine();
   }
}

Output

Enter number of rows and columns of the matrix  
Enter elements:  
Upper Triangular Matrix 

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