How can I perform multiplication without the '*' operator?

Question

I was just going through some basic stuff as I am learning C. I came upon a question to multiply a number by 7 without using the * operator. Basically it\'s like this

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Answer 1

public static void main(String[] args) {
    System.out.print("Enter value of A -> ");
    Scanner s=new Scanner(System.in);
    double j=s.nextInt();
    System.out.print("Enter value of B -> ");
    Scanner p=new Scanner(System.in);
    double k=p.nextInt();
    double m=(1/k);
    double l=(j/m);
    System.out.print("Multiplication of A & B=> "+l);
}