code13_randomdirections.ijm

//generating random steps
for(i =0; i<10; i++){
  print(randsteps());
}

function randsteps(){
	direction = "";
	r = random();
	if (r < 0.25)
		direction = "right";
	else if (r < 0.5)
		direction = "up";
	else if (r < 0.75)
		direction = "left";
	else 
		direction= "down";
	return direction;
}

This macro demonstrates how to choose four directions randomly.
The function "randomsteps()" is the key user-defined function. Line 8 generates a randome number between 0 and 1, and depending on its value, one of four directions is returned from the funciton.