Example: Pascal Triangle Pattern Program in Java using For loop

// Pascal Triangle Pattern Program in Java using For loop
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        int r, co = 1, ws, i, j;
        // r - denotes the number of rows
        // co - denotes the coefficient value
        // ws - denotes the white space

        System.out.println("-----Enter the number of rows to print the pattern-----");
        r = in.nextInt();

        System.out.println("\n-----This is the pascal triangle pattern-----\n");
        for (i = 0; i < r; i++) {
            System.out.print("\t");
            for (ws = 1; ws <= r - i; ws++) {
                System.out.print("  ");
            }
            
            for (j = 0; j <= i; j++) {
                if (j == 0 || i == 0)
                    co = 1;
                else
                    co = co * (i - j + 1) / j;
                System.out.printf("%4d", co);
            }
            System.out.print("\n");
        }
    }
}