Building Robots With Lego Mindstorms

Electronic Games • Chapter 22 435

Wait(100);

n++;

}

The variable error goes to 1 when check_sequence detects a mistake in the

user’s input, thus forcing the termination of the program, while n represents the

length of the sequence. MAX is a constant corresponding to the dimension of

the array, representing the maximum length of the sequence.

The generate sequence routine fills the array with random values in the range

0 to 2. In our example, we associated values of 0, 1, or 2 to the colors green, blue,

and red, respectively.

void generate_sequence()

{

int i;

for (i=0;i<MAX;i++)

{

seq[i]=Random(2);

}

}

The play_sequence subroutine needs little explanation. It plays ...