Hi, I am working on an question, which is provided below:
"A squad of robotic rovers are to be landed by NASA on a plateau on Mars. This plateau, which is curiously rectangular, must be navigated by the rovers so that their on-board cameras can get a complete view of the surrounding terrain to send back to Earth.
A rover's position and location is represented by a combination of x and y co-ordinates and a letter representing one of the four cardinal compass points. The plateau is divided up into a grid to simplify navigation. An example position might be 0, 0, N, which means the rover is in the bottom left corner and facing North.
In order to control a rover, NASA sends a simple string of letters. The possible letters are 'L', 'R' and 'M'. 'L' and 'R' makes the rover spin 90 degrees left or right respectively, without moving from its current spot. 'M' means move forward one grid point, and maintain the same heading.
Assume that the square directly North from (x, y) is (x, y+1).
INPUT:
The first line of input is the upper-right coordinates of the plateau, the lower-left coordinates are assumed to be 0,0.
The rest of the input is information pertaining to the rovers that have been deployed. Each rover has two lines of input. The first line gives the rover's position, and the second line is a series of instructions telling the rover how to explore the plateau.
The position is made up of two integers and a letter separated by spaces, corresponding to the x and y co-ordinates and the rover's orientation.
Each rover will be finished sequentially, which means that the second rover won't start to move until the first one has finished moving.
OUTPUT
The output for each rover should be its final co-ordinates and heading.
TEST INPUT:
5 5
1 2 N
LMLMLMLMM
3 3 E
MMRMMRMRRM
EXPECTED OUTPUT:
1 3 N
5 1 E"
My solution to the question is:
package roversonmars;
public class RoversOnMars {
//Variables
public int x; // rectangle vertical
public int y;// rectangle horizontal
public char compassPoint; // N,E,W,S
public static int xCoor, yCoor; // to set grids max points
//Constructors
public RoversOnMars(){
x = 0;
y = 0;
compassPoint = 'N';
}
public RoversOnMars(int x, int y, char compassPoint){
setX(x);
setY(y);
this.compassPoint = compassPoint;
}
//Accessor methods
public int getX(){
return x;
}
public int getY(){
return y;
}
public char getCompassPoint(){
return compassPoint;
}
//Mututator methods
public void setX(int x){
this.x = x;
}
public void setY(int y){
this.y = y;
}
public void setCompassPoint(int number){
switch(number){
case 1:
compassPoint = 'N';
case 2:
compassPoint = 'S';
case 3:
compassPoint = 'W';
case 4:
compassPoint = 'E';
}
}
public void CommandLetters(String command){
for(int i=0; i<command.length(); i++){
while(command.charAt(i) == 'L'){
x= x-1;
break;
}
while(command.charAt(i) == 'R'){
x = x+1;
break;
}
while(command.charAt(i) == 'M'){
if(compassPoint == 'N'){
y = y+1;
}
else if(compassPoint == 'E'){
x = x -1;
}
else if(compassPoint == 'W'){
x = x+1;
}
else if(compassPoint == 'S'){
y = y-1;
}
break;
}
}
}
public void setPlateauCoordinate(int a, int B)/>{
xCoor = a;
yCoor = b;
}
public static void main(String[] args) {
RoversOnMars rover = new RoversOnMars(1,2,'N');
rover.setPlateauCoordinate(5, 5);
System.out.println("Coordinates of the plateau: " + xCoor + " " + yCoor);
System.out.println("Rover's position: " + rover.getX() + " " + rover.getY() + " " + rover.getCompassPoint());
rover.CommandLetters("LMLMLMLMM");
System.out.println(rover.getX() + " " + rover.getY() + " " + rover.getCompassPoint());
}
}
It gives me the wrong output, I am about to freak out.
![:gun_bandana:]()
![:gun_bandana:]()
I cannot find the point that I did wrong.
I need to solve this question as early as possible.
Thanks for any help.
