Multiply a given Integer with 3.5 | GeeksforGeeks

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

int multiplyWith3Point5(int x)

{

  return (x<<1) + x + (x>>1);

} 

2. Another way of doing this could be (8*x – x)/2

int multiplyWith3Point5(int x)

{

  return ((x<<3) - x)>>1;

}

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