Exercise #1

So, we've seen something useful in the mathematical sense concerning using 2D arrays. Let's practice with 2D arrays by creating a program of your own according to the following specifications :

• Your program should allow the user to type in a 3x3 matrix which is to be stored in a 2D array of integers.
• The program should then calculate the determinant of this 3x3 matrix and print out both the matrix and its determinant.

The deternimant, d, is d = aei + bfg + cdh - afh - bdi - ceg

Exercise #2

Here's your first animation exercise!

• Make two 2-D arrays that have a smiley face like so:

• Make two functions that contain each 2-D array and displays it.
• Have main() call each function repeatedly, 10 times, it will look like the smiley face is winking!
• Feel free to be creative and use other characters instead of '#' to give the face a "smooth" look.

Hints:

• Use the commmand:
  system("clear");
  to clear the screen for you so that the picture appears in the same place each time.
  NOTE: to use the system call you must first: #include <stdlib.h>
• Use the commmand:
  system("sleep 1");
  To make the computer pause for one second (if your picture blinks too fast)
• To save yourself some work declare the 2-D array like this example:

       char cross[3][3] = 
                          { 'T', 'T', 'T',
                            ' ', 'T', ' ',
                            ' ', 'T', ' ' };
  

  This inserts the spaces and 'T' in the corresponding spots. You can only do this when you first declare the array.
• Be patient. You will find that any graphics program will require a lot of repetitive work and fixing small details.