Revert Costs Less Than Require

CompareAsssertions.sol

pragma solidity ^0.4.19;

contract CompareAssertions {

  function requireExample (uint256 input) public pure returns (uint256) {
    require(input > 5);
    uint256 result = 5 * input;
    require(result > input);
    return result;
  }

  function revertExample (uint256 input) public pure returns (uint256) {
    uint256 result;
    if (input < 5 || ((result = 5 * input) < input)) revert();

    return result;
  }
}