Printing Pascals Triangle (recursive) (JAVA)

Question

So far I have this, but I am not quite sure how printPTriangle can print the triangle using the code. If someone could help me out with this, I would be grateful.

public static int factorial(int n) {
    if (n == 1) {
        return 1;
    }
    return n * (factorial(n - 1));
}

public static int pascalsNumber(int x, int y) {
    return factorial(x)/(factorial(y) * factorial((x - y))); //Using combinations formula
}

public static void printPTriangle(int z) {



}

Answer 1

Try this,

public class PascalTriangle {

public static void main(String[] args) {

    int rows = 10;


    for(int i =0;i<rows;i++) {
        int number = 1;
        System.out.format("%"+(rows-i)*2+"s","");
        for(int j=0;j<=i;j++) {
             System.out.format("%4d",number);
             number = number * (i - j) / (j + 1);

        }
        System.out.println();
    }

}
}

Note the formatting commands used above to create a nicely formatted triangle. %4d instructs the formatter to print the number within 4 spaces.