[GeeksForGeeks] Multiply a given integer by 3.5

Posted 2020-09-28 Push your limit!

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.

 1 public class Solution {
 2     public int multiply3point5(int x){
 3         return (x << 1) + x + (x >> 1);
 4     }
 5     public static void main(String[] args){
 6         Solution sol = new Solution();
 7         assert sol.multiply3point5(2) == 7;
 8         assert sol.multiply3point5(5) == 17;
 9     }
10 }