Complete the following function that takes an integer as an argument and returns a power of two greater than or equal to input. If input is less than 1, the function should return 0. If input would cause an overflow, return 0.

Example input/output: 1. 8 => 8 2. 15 => 16 2. 17 => 32

Note: - Feel free to use a text editor or IDE of your choice to do this instead. - If you do, simply just copy-paste your code here when you're done. - Do not change function signature. - You are free to add any supporting helper functions, data types, or structures you wish. - You may make use of STL data structures and algorithms - main function has been provided to make code run inside Rextester Web IDE. It is not required to be part of the submission and will not be graded.