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How to multiply two numbers recursively without using multiplication, division, bitwise and loops in Java

1 Answer

0 votes
package javaapplication1;
 

public class JavaApplication1 {
  
    public static void main(String[] args) {
         
        System.out.format("3 * 7 = %d\n", multiply(3, 7));
        System.out.format("3 * 0 = %d\n", multiply(3, 0));
        System.out.format("0 * 3 = %d\n", multiply(0, 3));
        System.out.format("3 * -5 = %d\n", multiply(3, -5));
        System.out.format("-3 * 6 = %d\n", multiply(-3, 6));
    }
    
    static int multiply(int x, int y) {
        if (y > 0)
            return (x + multiply(x, y - 1));
 
        if (y < 0)
            return -multiply(x, -y);
 
        return 0;
    }
}
    
/*
run:
   
3 * 7 = 21
3 * 0 = 0
0 * 3 = 0
3 * -5 = -15
-3 * 6 = -18
    
*/

 




answered May 13, 2017 by avibootz
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