[GeeksForGeeks] Multiply a given integer by 3.5

Given an integer x, write a method that multiplies x with 3.5 and returns the integer result. You are not allowed to use %, /, or *.

Examples:  input 2, output 7; input 5, output 17

 

Solution. Use left shift and right shift operators.

public class Solution {
    public int multiply3point5(int x){
        return (x << 1) + x + (x >> 1);
    }
    public static void main(String[] args){
        Solution sol = new Solution();
        assert sol.multiply3point5(2) == 7;
        assert sol.multiply3point5(5) == 17;
    }
}