I am new to AI and I would like to know how to test for a collision between a robot and a missile. The game is pretty basic, just a character moving along the bottom of the screen with missiles being dropped on him from an enemy moving along the top of the screen. The x value is the only co-ordinate of the character that changes, the y stays the same. The x value and y value of the missile changes. I don't want any code, just a general idea of the best way to do it.

Check if the missles x coordinate is somewhere within the X and X + width of your character.

i.e.

character Width = 8

if missle y >= some number where it could possible hit the charater

AND

missle x is >= character x and missle x is <= to (character x + character width)

then

you have a colision.