Write an efficient c++ function that takes any integer value i and returns 2^i ,as a long value. your function should not multiply 2 by itself i times; there are much faster ways of computing 2^i.

long power(int i)

{

   return pow(2,i);

}

Explanation:

The above written function is in C++.It does not uses loop.It's return type is long.It uses the function pow that is present in the math library of the c++.It takes two arguments return the result as first argument raised to the power of second.

for ex:-

pow(3,2);

It means 3^2 and it will return 9.

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