Based on the below code. How is the program organized? What major data structures were used?...
Based on the below code. How is the program organized? What major data structures were used? How are commands processed? How is the PacMan’s state maintained? Etc. This section should take about ½ to 2/3 of the paper content. Do not repeat the project specifications (assume the reader is knowledgeable of the project specifications). 2. What alternative approaches were considered and why were they rejected? 3. What did you learn from doing this project and what would you do differently?
import java.util.Scanner;
public class MyPacman
{
static void displayModule(char array[][])
{
for(int i = 0; i <
array.length; i++)
{
for(int j
= 0; j < array[i].length; j++)
{
System.out.print(array[i][j]);
}
System.out.println();
}
}
public static void main(String args[])
{
int rows, columns;
int curRow = 0, curCol = 0,
noOfEats = 0, noOfCommands = 0;
Scanner myIn = new
Scanner(System.in);
System.out.print("Give the
no. of rows & columns: ");
rows = myIn.nextInt();
columns =
myIn.nextInt();
char array[][] = new
char[rows][columns];
int noOfCookies = (int)(0.2 *
rows * columns);
for(int i = 0; i < rows;
i++)
{
for(int j
= 0; j < columns; j++)
{
array[i][j] = '.';
}
}
array[0][0] = '>';
for(int i = 0; i <
noOfCookies; i++)
{
int myR =
(int)(Math.random() * rows);
int myC =
(int)(Math.random() * columns);
if(array[myR][myC] == '.') array[myR][myC] = 'O';
else
i--;
}
while(true)
{
int
moves;
displayModule(array);
do
{
System.out.print("1: To turn left\n2: To turn
right\n3: To move\n4: To exit\nEnter : ");
moves = myIn.nextInt();
if(moves < 1 || moves > 4)
System.out.println("Command
Invalid");
}
while(moves < 1 || moves > 4);
switch(moves)
{
case 1:
if(array[curRow][curCol] ==
'<')
array[curRow][curCol] = 'v';
else if(array[curRow][curCol]
== 'v')
array[curRow][curCol] = '>';
else if(array[curRow][curCol]
== '>')
array[curRow][curCol] = '^';
else if(array[curRow][curCol]
== '^')
array[curRow][curCol] = '<';
noOfCommands++;
break;
case 2:
if(array[curRow][curCol] ==
'<')
array[curRow][curCol] = '^';
else if(array[curRow][curCol]
== 'v')
array[curRow][curCol] = '<';
else if(array[curRow][curCol]
== '>')
array[curRow][curCol] = 'v';
else if(array[curRow][curCol]
== '^')
array[curRow][curCol] = '>';
noOfCommands++;
displayModule(array);
break;
case 3:
if(array[curRow][curCol] ==
'<')
{
if(array[curRow].length > curCol + 1)
{
array[curRow][curCol] = ' ';
if(array[curRow][curCol + 1] == 'o')
noOfCookies++;
array[curRow][curCol + 1] =
'<';
curCol++;
noOfCommands++;
}
}
else if(array[curRow][curCol]
== 'v')
{
if(curRow
> 0)
{
array[curRow][curCol] = ' ';
if(array[curRow - 1][curCol] == 'o')
noOfCookies++;
array[curRow - 1][curCol] =
'v';
curRow--;
noOfCommands++;
}
}
else if(array[curRow][curCol]
== '>')
{
if(curCol
> 0)
{
array[curRow][curCol] = ' ';
if(array[curRow][curCol - 1] == 'o')
noOfCookies++;
array[curRow][curCol - 1] =
'>';
curCol--;
noOfCommands++;
}
}
else if(array[curRow][curCol]
== '^')
{
if(array.length > curRow + 1)
{
array[curRow][curCol] = ' ';
if(array[curRow + 1][curCol] == 'o')
noOfCookies++;
array[curRow + 1][curCol] =
'^';
curRow++;
noOfCommands++;
}
}
break;
case 4:
System.out.println("No. of
Moves: " + noOfCommands);
System.out.println("No. of
cookies: " + noOfCookies);
System.out.println("No. of
moves / cookie: " + noOfCommands / noOfCookies);
return;
default:
break;
}
System.out.println();
}
}
}
Homework Answers
import java.util.Scanner;
public class MyPacman {
// to print the current state of the pacman game
static void displayModule(char array[][]) {
for (int i = 0; i < array.length; i++) {
for (int j = 0; j < array[i].length; j++) {
System.out.print(array[i][j]);
}
System.out.println();
}
}
public static void main(String args[]) {
int rows, columns; // size of the grid
int curRow = 0, curCol = 0; // current position
int noOfEats = 0, noOfCommands = 0; // to store the points
// scanner to take user input
Scanner myIn = new Scanner(System.in);
System.out.print("Give the no. of rows & columns: ");
rows = myIn.nextInt();
columns = myIn.nextInt();
// Create a 2-D array of characters to represent the game grid
char array[][] = new char[rows][columns];
// 20% of the cells will be filled with cookies
int noOfCookies = (int) (0.2 * rows * columns);
// we are flling the cells with '.' character, which shows they are
// empty at start
for (int i = 0; i < rows; i++) {
for (int j = 0; j < columns; j++) {
array[i][j] = '.';
}
}
// The below line shows the starting position of pacman
array[0][0] = '>';
// Generating cookies at random positions
for (int i = 0; i < noOfCookies; i++) {
int myR = (int) (Math.random() * rows);
int myC = (int) (Math.random() * columns);
if (array[myR][myC] == '.')
array[myR][myC] = 'O';
else
i--;
}
// keep asking user choice till game is over or user want to exit
while (true) {
int moves;
displayModule(array);
// ask for a valid choice
do {
System.out
.print("1: To turn left\n2: To turn right\n3: To move\n4: To exit\nEnter : ");
moves = myIn.nextInt();
if (moves < 1 || moves > 4)
System.out.println("Command Invalid");
} while (moves < 1 || moves > 4);
// decide the functionality based on user choice
switch (moves) {
case 1:
// based on current direction, we need to make a left turn of pacman
if (array[curRow][curCol] == '<')
array[curRow][curCol] = 'v';
else if (array[curRow][curCol] == 'v')
array[curRow][curCol] = '>';
else if (array[curRow][curCol] == '>')
array[curRow][curCol] = '^';
else if (array[curRow][curCol] == '^')
array[curRow][curCol] = '<';
noOfCommands++;
break;
case 2:
// based on current direction, we need to make a right turn of pacman
if (array[curRow][curCol] == '<')
array[curRow][curCol] = '^';
else if (array[curRow][curCol] == 'v')
array[curRow][curCol] = '<';
else if (array[curRow][curCol] == '>')
array[curRow][curCol] = 'v';
else if (array[curRow][curCol] == '^')
array[curRow][curCol] = '>';
noOfCommands++;
displayModule(array);
break;
case 3:
// based on current position and direction, increase the position by one.
if (array[curRow][curCol] == '<') {
// left direction
// dont let it go outside the grid
if (array[curRow].length > curCol + 1) {
array[curRow][curCol] = ' ';
// check if we got the cookie
if (array[curRow][curCol + 1] == 'o')
noOfEats++;
array[curRow][curCol + 1] = '<';
curCol++;
noOfCommands++;
}
} else if (array[curRow][curCol] == 'v') {
// down direction
if (curRow > 0) {
array[curRow][curCol] = ' ';
if (array[curRow - 1][curCol] == 'o')
noOfEats++;
array[curRow - 1][curCol] = 'v';
curRow--;
noOfCommands++;
}
} else if (array[curRow][curCol] == '>') {
// right direction
if (curCol > 0) {
array[curRow][curCol] = ' ';
if (array[curRow][curCol - 1] == 'o')
noOfEats++;
array[curRow][curCol - 1] = '>';
curCol--;
noOfCommands++;
}
} else if (array[curRow][curCol] == '^') {
// Up direction
if (array.length > curRow + 1) {
array[curRow][curCol] = ' ';
if (array[curRow + 1][curCol] == 'o')
noOfEats++;
array[curRow + 1][curCol] = '^';
curRow++;
noOfCommands++;
}
}
break;
case 4:
System.out.println("No. of Moves: " + noOfCommands);
System.out.println("No. of cookies: " + noOfEats);
System.out.println("No. of moves / cookie: " + noOfCommands
/ noOfEats);
return;
default:
break;
}
System.out.println();
myIn.close();
}
}
}
=======================================
How is the program organized?
We are taking a character 2-D array as the game grid where pacman
is at one particular positon with some direction.. It can move and
eat cookies.
What major data structures were used?
A charcter 2-D array
How are commands processed?
We read the command and based on current direction, we process the
command in a switch statement
How is the PacMan’s state maintained?
We have got <,>,v,^ symbols for maintaing the direction, and
2 variables for maintaining the current positon.
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