multiply 2 numbers without using * sign

Question

Alon · Accepted Answer

int MyMul(int a, int b) { int result = 0; while (b > 0) { if ((b & 1) == 1) { result += a; } b >>= 1; a <<= 1; } return result; }

Todd · Answer

We need to handle cases where both inputs are positive, both are negative, or one is positive and the other is negative:

public static int mult(int a, int b) {
        int product = 0;
        boolean positiveProduct = !(a >= 0 ^ b >= 0);
        a = Math.abs(a);
        b = Math.abs(b);
        int min = Math.min(a, b);
        int max = Math.max(a, b);

        while (min > 0) {
            if (positiveProduct)
                product += max;
            else
                product -= max;
            min--;
        }

        return product;
    }

Amey · Answer

import java.util.Scanner;

public class MultiplyWithoutSign{
	public static void main(String args[]){
			Scanner in = new Scanner(System.in);
			System.out.println("Enter the two numbers");
			int x = in.nextInt();
			int y = in.nextInt();
			int sum=0;
			for( int i =0; i

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