creating a simple two-dimensional predator2ey simulation. In this simulation the prey
are ants and the predators are doodlebugs. These critters live in a world composed of a 20 übr>20 grid of cells. Only one critter may occupy a cell at a time. The grid is enclosed, so a critter
is not allowed to move off the edges of the world. Time is simulated in time steps. Each critter
performs some action every time step.
The ants behave according to the following model:
ove. Every time step, randomly try to move up, down, left, or right. If the neighboring
cell in the selected direction is occupied or would move the ant off the grid, then the ant
stays in the current cell.
reed. If an ant survives for three time steps, then at the end of the time step (that is,
after moving) the ant will breed. This is simulated by creating a new ant in an adjacent
(up, down, left, or right) cell that is empty. If there is no empty cell available, then no
breeding occurs. Once an offspring is produced, an ant cannot produce an offspring until
three more time steps have elapsed.
The doodlebugs behave according to the following model:
ove. Every time step, if there is an adjacent ant (up, down, left, or right), then the
doodlebug will move to that cell and eat the ant. Other- wise, the doodlebug moves
according to the same rules as the ant. Note that a doodlebug cannot eat other doodlebugs.
reed. If a doodlebug survives for eight time steps, then at the end of the time step it will
spawn off a new doodlebug in the same manner as the ant.
tarve. If a doodlebug has not eaten an ant within the last three time steps, then at the
end of the third time step it will starve and die. The doodlebug should then be removed
from the grid of cells