Q:

# Kotlin program to print upper triangular matrix

belongs to collection: Kotlin Array Programs

An upper triangular matrix is a matrix in which all the lower triangular elements are zero, or all the elements below the principle diagonal will be zero.

Given a matrix, we have to print its upper triangular.

Example:

```    Input:
matrix:
[2, 3, 4]
[5, 6, 7]
[8, 9, 8]

Output:
Upper Triangular of Matrix :
[2, 3, 4]
[0, 6, 7]
[0, 0, 8]```

### Program to print upper triangular matrix in Kotlin

``````package com.includehelp

import java.util.*

// Main function, Entry Point of Program
fun main(args: Array<String>) {

//variable of rows and col
val rows: Int
val column: Int

//Input Stream
val scanner = Scanner(System.`in`)

//Input no of rows and column
print("Enter the number of rows and columns of matrix : ")
rows   = scanner.nextInt()
column = scanner.nextInt()

if(rows!=column) {
println("Matrix should be Square matrix , Rows and Col size must be Same !!")
return
}

//Create Array
val matrixA     = Array(rows) { IntArray(column) }

//Input Matrix
println("Enter the Elements of First Matrix (\$rows X \$column} ): ")
for(i in matrixA.indices){
for(j in matrixA[i].indices){
print("matrixA[\$i][\$j]: ")
matrixA[i][j]=scanner.nextInt()
}
}

//print Matrix A
println("Matrix A : ")
for(i in matrixA.indices){
println("\${matrixA[i].contentToString()} ")
}

//get Upper Triangular of matrix
for(i in matrixA.indices){
for(j in matrixA[i].indices){
if(j<i) matrixA[i][j]=0
}
}

//print Matrix A
println("Upper Triangular of Matrix : ")
for(i in matrixA.indices){
println("\${matrixA[i].contentToString()} ")
}
}
``````

Output

```Run 1:
Enter the number of rows and columns of matrix : 4
3
Matrix should be Square matrix , Rows and Col size must be Same
---
Run 2:
Enter the number of rows and columns of matrix : 3
3
Enter the Elements of First Matrix (3 X 3} ):
matrixA[0][0]: 2
matrixA[0][1]: 3
matrixA[0][2]: 4
matrixA[1][0]: 5
matrixA[1][1]: 6
matrixA[1][2]: 7
matrixA[2][0]: 8
matrixA[2][1]: 9
matrixA[2][2]: 8
Matrix A :
[2, 3, 4]
[5, 6, 7]
[8, 9, 8]
Upper Triangular of Matrix :
[2, 3, 4]
[0, 6, 7]
[0, 0, 8]```