#include "franca.h"

#include <math.h>

// recursive maze exploration

Robot Tracer(1); //c4back1.cpp

Box message;

Clock myclock;

int howlong;

void explore1()

{

int direction; // Direction she will face

while(myclock.time()<howlong)

{ //

do

{

direction=rand()%4;

Tracer.face(direction);

Tracer.mark(7);

} // repeat until the direction

// leads to free square.

while (Tracer.seewall());

// Once the square ahead is clear ...

Tracer.mark(); // Mark it green

Tracer.step(); // Step forward

explore1(); // continue

// This part will only be executed after

// exploration is done!

Tracer.face(direction+2);

Tracer.step();

}

message.say("coming back!");

}

void mainprog()

{

howlong=ask("How long do you want it?");

explore1();

}