How can Karel check if it's a corner on the grid?

Karel can determine whether it is at a corner on the grid by using conditions to check the walls surrounding it. Specifically, a corner is defined as a position where Karel is adjacent to walls in two directions, which means there are walls both in front and to one side. By checking for these walls, Karel can programmatically ascertain its position.

In practical terms, Karel would evaluate its surroundings through commands that assess whether there are walls in front and to either side, thus confirming it is at a corner. This method leverages logical conditions, allowing Karel to respond accordingly based on its location on the grid. Such programming is foundational in robotics and grid navigation, making it crucial for Karel to identify corners correctly as it navigates through its environment.