/**
   roomba2.cpp
   31-jan-2007/sklar
   
   this program expands on roomba.cpp by allowing the user to enter
   commands telling the robot to go forward, backward, left or right.
  
*/



// section 1: include C++ library definitions
#include <iostream>
using namespace std;


// section 2: declare variables
int x; // robot's x position
int y; // robot's y position
char c; // user's input
bool q; // does user want to quit?


// section 3: declare methods
int display() {
  cout << "the roomba is at location (";
  cout << x;
  cout << ",";
  cout << y;
  cout << ")\n";
  return 0;
} // end of display()


int moveForward() {
  cout << "moving forward...\n";
  y = y + 1;
  return 0;
} // end of moveForward()


int moveBackward() {
  cout << "moving backward...\n";
  y = y - 1;
  return 0;
} // end of moveBackward()


int moveLeft() {
  cout << "moving left...\n";
  x = x - 1;
  return 0;
} // end of moveLeft()


int moveRight() {
  cout << "moving right...\n";
  x = x + 1;
  return 0;
} // end of moveRight()




// section 4: define main method
int main() {
  x = 0;
  y = 0;
  q = false;
  while ( q==false ) {
   cout << "which way should roomba move (enter F,B,L,R or Q)? ";
   cin >> c;
   cout << "you entered: ";
   cout << c;
   cout << "\n";
   if ( c=='F' ) {
     moveForward();
     display();
   }
   else if ( c=='B' ) {
     moveBackward();
     display();
   }
   else if ( c=='L' ) {
     moveLeft();
     display();
   }
   else if ( c=='R' ) {
     moveRight();
     display();
   }
   else if ( c=='Q' ) {
     q = true;
   }
   else {
     cout << "oops! you entered something invalid. please try again :-)\n";
   }
  } // end while q==false 
} // end of main()