*if_food_ahead(a,b)*: if the `ant' faces a food pellet then evaluate*a*, else evaluate*b*,*progn2(a,b)*: evaluate*a*, then*b*, returning*b*'s value, and*progn3(a,b,c)*: evaluate*a, b*then*c*, returning*c*'s value.

*left*: turn the `ant' left by 90 degrees,*right*: turn the `ant' right by 90 degrees, and*move*: move the `ant' forward by one square/step.

S Gustafson 2004-05-20