Java Program to Display Lower Triangular Matrix

// Java program for displaying lower triangular matrix
import java.io.*;

class GFG {
    static void lowerTriangularMatrix(int matrix[][])
    {
        int row = matrix.length;
        int col = matrix[0].length;

        // if number of rows and columns are not equal,
        // then return back
        if (row != col) {
            System.out.println(
                "Matrix should be a Square Matrix");
            return;
        }
        else {
            // looping over the whole matrix
            for (int i = 0; i < row; i++) {
                for (int j = 0; j < col; j++) {

                    // for the rows,whose column number is
                    // greater then row number,mark the
                    // element as 0
                    if (i < j) {
                        matrix[i][j] = 0;
                    }
                }
            }

            System.out.println(
                "Lower Triangular Matrix is given by :-");
            // printing the lower triangular matrix
            for (int i = 0; i < row; i++) {
                for (int j = 0; j < col; j++) {
                    System.out.print(matrix[i][j] + " ");
                }
                System.out.println();
            }
        }
    }
    public static void main(String[] args)
    {
        // driver code
        int mat[][]
            = { { 2, 1, 4 }, { 1, 2, 3 }, { 3, 6, 2 } };
        // calling the function
        lowerTriangularMatrix(mat);
    }
}