This program display Upper Triangular Matrix in java 2D Array.
In this program we enter the values
into matrix and we are going to print the above diagonal and lower diagonal
elements zero.
import java.util.*;
public class PrintUpperTriangularMatrix
{
public static void
main(String args[])
{
int m, n, i, j;
int a[][]=new
int[10][10];
Scanner sc=new Scanner (System.
In);
System.out.println("Enter the order of a square matrix :");
m=sc.nextInt();
n=sc.nextInt();
/* checking order of
matrix and then if true then enter the values
* into the matrix a[][]
*/
if(m == n)
{
System.out.println("Enter elements in the matrix:"+m*n);
for(i=0; i<m; i++)
{
for(j=0; j<n; j++)
a[i][j]=sc.nextInt();
}
}
// Display the entered
value
System.out.println ("You
have entered the following matrix");
for (i=0; i<m; i++)
{
for (j=0; j<n; j++)
System.out.print (a[i][j]
+ " ");
System.out.println ();
}
// Display the Upper
Triangular Matrix
System.out.println("Upper triangular matrix the given matrix is:");
for(i=0; i<m; i++)
{
for(j=0; j<n; j++)
{
if(i>j)
a[i][j] = 0;
System.out.print(a[i][j] + " ");
}
System.out.println();
}
}
}
Sample Output
Enter the order of a square matrix:
4
4
Enter elements in the matrix: 16
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
You have entered the following matrix
1 2 3 4
5 6 7 8
9 1 2 3
4 5 6 7
Upper triangular matrix the given matrix is:
1 2 3 4
0 6 7 8
0 0 2 3
0 0 0 7
Variable Description
Sl. No.
|
Variable Name
|
Data Type
|
Purpose
|
1
|
main()
|
static void
|
Main function
|
2
|
a[][]
|
int
|
To store the values in an 2D array
|
3
|
i , j
|
int
|
For running the loop
|
4
|
m, n
|
For order of the matrix
|
|
4
|
sc
|
Scanner
|
To instantiate the Scanner class which
exists in java.util.* package
|
