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

Examples :Input: 2 Output: 7 Input: 5 Output: 17 (Ignore the digits after decimal point)

Solution:

**1. **We can get x*3.5 by adding 2*x, x and x/2. To calculate 2*x, left shift x by 1 and to calculate x/2, right shift x by 2.

## C++

// C++ program to multiply // a number with 3.5 #include <bits/stdc++.h> int multiplyWith3Point5(int x) { return (x<<1) + x + (x>>1); } /* Driver program to test above functions*/ int main() { int x = 4; printf("%d", multiplyWith3Point5(x)); getchar(); return 0; }

## Java

// Java Program to multiply // a number with 3.5 class GFG { static int multiplyWith3Point5(int x) { return (x<<1) + x + (x>>1); } /* Driver program to test above functions*/ public static void main(String[] args) { int x = 2; System.out.println(multiplyWith3Point5(x)); } } // This code is contributed by prerna saini.

## Python3

# Python 3 program to multiply # a number with 3.5 def multiplyWith3Point5(x): return (x<<1) + x + (x>>1) # Driver program to # test above functions x = 4 print(multiplyWith3Point5(x)) # This code is contributed by # Smitha Dinesh Semwal

## C#

// C# Program to multiply // a number with 3.5 using System; class GFG { static int multiplyWith3Point5(int x) { return (x<<1) + x + (x>>1); } /* Driver program to test above functions*/ public static void Main() { int x = 2; Console.Write(multiplyWith3Point5(x)); } } // This code is contributed by Sam007

## PHP

<?php // PHP program to multiply // a number with 3.5 function multiplyWith3Point5( $x) { return ($x << 1) + $x + ($x >> 1); } // Driver Code $x = 4; echo multiplyWith3Point5($x); // This code is contributed by vt_m. ?>

**2. **Another way of doing this could be (8*x – x)/2 (See below code). Thanks to ajaym for suggesting this.

#include <stdio.h> int multiplyWith3Point5(int x) { return ((x<<3) - x)>>1; }

Please write comments if you find the above code/algorithm incorrect, or find better ways to solve the same problem

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