Q_02.java

package Big_O;

public class Q_02 {

	public static int power(int a, int b) {
		if (b < 0) {
			return 0; // error
		} else if (b == 0) {
			return 1; 
		} else {
			return a * power(a, b - 1);
		}
	}
	
	public static void main(String[] args) {
		System.out.println(power(3, 4));
	}

}