Getting Started
Refer to Lab 1 if you need a reminder about how to start Cygwin Terminal or Notepad++.
Start by downloading CS101_Lab16.zip, saving it in the directory H:\CS101.
Start a Cygwin Terminal and run the following commands:
cd h:
cd CS101
unzip CS101_Lab16.zip
cd CS101_Lab16
Using Notepad++, open the file
H:\CS101\CS101_Lab16\GrassFire.cpp
Run the command
make
when you are ready to compile the program. To run the program, run the command
./GrassFire.exe
Your Task
Your task is to implement a one-dimensional grass fire simulation using functions. The simulation consists of a sequence of cells, each of which represents either grass or fire. At each time step of the simulation, cells are updated according to the following rules:
- If a cell is currently grass, and either its left or right neighbors is one fire, then it catches on fire
- If a cell is currently on fire, it stays on fire
The program should prompt the user to enter how many cells there will be, the initial data for each cell (0 is grass, 1 is fire), and how many generations to simulate.
The first line of output should be the initial state. The rest of the lines of output should indicate each subsequent state (as the initial fires spread.)
Example run (user input in bold):
How many cells? 20 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 How many generations? 8 ,,,,*,,,,,,,,,*,,,,, ,,,***,,,,,,,***,,,, ,,*****,,,,,*****,,, ,*******,,,*******,, *********,*********, ******************** ******************** ******************** ********************
Functions
To simplify the simulation, implement the following functions:
void read_cells(int cells[], int num_cells)
This function should read exactly num_cells integer values and store them in the elements of the cells array.
void print_cells(int cells[], int num_cells)
This function should print a textual representation of the contents of the cells array. Each 0 value in the array should result in a comma (,) being printed, and each 1 value should result in an asterisk (*) being printed. The num_cells parameter specifies the number of elements in the cells array.
void update_cells(int cells[], int num_cells)
This function should implement one time step of the simulation. Each element in the cells array should be updated according to the rules of the simulation. Note that you will probably want to use a temporary array within the function to store the new values, and then copy the updated values back to the original cells array. Hint: use the copy_cells function (see below) to copy the contents of the temporary array back to the original array. The num_cells parameter specifies the number of elements in the cells array.
void copy_cells(int source[], int dest[], int num_cells)
Copy all of the element values from the source array to the dest array. The num_cells parameter specifies how many elements are in the source array.
Hints/Specifications
The program should allow at least 100 cells to be simulated. Use a #define constant to specify this maximum, and use it when declaring your array(s).
Start by getting the user input. Implement the read_cells function to read the cell values into the array.
Next, implement the print_cells function so that the program can print out the initial configuration of the simulation.
Finally, implement the simulation loop so that it calls the update_cells and print_cells functions. It will be helpful to call copy_cells from the update_cells function, in order to copy the update cell value back into the main cell data array.
Important: make sure that your update_cells function does not make any out of bounds array accesses. Specifically, updating the first and last cell will need to be handled specially because they have no left and right neighbor, respectively. These nonexistent neighbors should be considered to be grass (not on fire).
Submitting
To submit your work, type the command
make submit
Enter your Marmoset username and password (which you should have received by email.) Note that your password will not be echoed to the screen.
Important:
You must submit your work before leaving class. If you do not submit, you will not receive any credit for the lab.
