CMIS 141

Lab exercise

Roman

Write a program that converts Roman numeral numbers to decimal
numbers.

The Roman number will be a sequence of Roman numeral characters like
MDCCLXXVI
where an M equals 1000
D is 500
C is 100
L is 50
X is 10
V is 5
I is 1

Input into a String object.  Loop over the length() of the string, using
the charAt() method to access the individual characters which can be
switched on.
Base your code on the CharTest program.


************************************************************
Mr. Celsius and Mr. Fahrenheit

Write a program that produces a table of fahrenheit to celsius
temperature conversions.  The user enters the starting temperature,
the ending temperature, and the increment value.  Display the table in
a JTextArea in a JOptionPane.
Formula to convert fahrenheit to celsius is:
   C = 5(F-32)/9

Add the ability to convert from celsius to fahrenheit.  Formula to
convert celsius to fahrenheit is:
   F = 9C/5+32
Let the user choose which conversion to do.



************************************************************
Random points of light.

Make a program similar to the RandomPoints applet.  Hint: nested
loops: outer loop over the rows, inner loop over the columns of each
row (just like the rectangles of stars program of last week).  
Base your program on your rectangles program.

Make the JTextArea the user-specified number of rows and columns.  Use
  Math.random()<percent/100.0 
to determine if each position should be "on" or "off".

For the paint method use getHeight() and getWidth() to know the number
of rows and columns (don't use the user-specified size, it'll be
tiny). To put a single point (pixel) use drawLine(i,j,i,j) to draw a
"line" from a point to itself.
It can be made more colorful by adding different colors.