# C# program to print the upper triangular matrix

Here, we are going to learn how to print the upper triangular matrix in C#?
Submitted by Nidhi, on November 02, 2020 [Last updated : March 19, 2023]

## Printing Upper Triangular Matrix

Here, we will read a matrix from the user and then print the upper triangular matrix..

## C# code to print upper triangular matrix

The source code to print the upper triangular matrix is given below. The given program is compiled and executed successfully on Microsoft Visual Studio.

```//C# program to print upper triangular matrix.

using System;

class MatrixDemo
{
public static void Main(string[] args)
{
int i = 0;
int j = 0;

int row = 3;
int col = 3;

int[,] Matrix= new int[row, col];

Console.Write("Enter the elements of matrix: ");
for (i = 0; i < row; i++)
{
for (j = 0; j < col; j++)
{
}
}

Console.WriteLine("\nMatrix: ");
for (i = 0; i < row; i++)
{
for (j = 0; j < col; j++)
{
Console.Write(Matrix[i, j] + "\t");

}
Console.WriteLine();
}

Console.WriteLine("Upper triangular matrix: ");
for (i = 0; i < row; i++)
{
Console.WriteLine();
for (j = 0; j < col; j++)
{
if (i <= j)
Console.Write(Matrix[i, j] + "\t");
else
Console.Write(" \t");
}
}
Console.WriteLine();
}
}
```

## Output

```Enter the elements of matrix: 1
2
3
4
5
6
7
8
9

Matrix:
1       2       3
4       5       6
7       8       9
Upper triangular matrix:

1       2       3
5       6
9
Press any key to continue . . .
```

## Explanation

In the above program, we created a class MatrixDemo that contains a Main() method. The Main() method is the entry point for the program, Here, we created a 2-D array to represent a matrix with size 3X3.

```Console.Write("Enter the elements of matrix: ");
for (i = 0; i < row; i++)
{
for (j = 0; j < col; j++)
{
}
}
```

In the above code, we read elements of the matrix form user.

```Console.WriteLine("Upper triangular matrix: ");
for (i = 0; i < row; i++)
{
Console.WriteLine();
for (j = 0; j < col; j++)
{
if (i <= j)
Console.Write(Matrix[i, j] + "\t");
else
Console.Write(" \t");
}
}
```

In the above code, we printed the upper triangular matrix, here we replaced non-upper triangular matrix elements by space that's why the upper triangular matrix is visible properly on the console screen.