text: Program to check if matrix is upper triangular | Java Program to check upper triangular matrix . ; Function to check matrix is in upper triangular form or not . ; driver function
code: import java . util . * ; import java . lang . * ; public class GfG { private static final int N = 4 ; public static Boolean isUpperTriangularMatrix ( int mat [ ] [ ] ) { for ( int i = 1 ; i < N ; i ++ ) for ( int j = 0 ; j < i ; j ++ ) if ( mat [ i ] [ j ] != 0 ) return false ; return true ; } public static void main ( String argc [ ] ) { int [ ] [ ] mat = { { 1 , 3 , 5 , 3 } , { 0 , 4 , 6 , 2 } , { 0 , 0 , 2 , 5 } , { 0 , 0 , 0 , 6 } } ; if ( isUpperTriangularMatrix ( mat ) ) System . out . println ( " Yes " ) ; else System . out . println ( " No " ) ; } }