Beginning AppleScript®

2.8. Exercises

1. Which of the following are invalid variable names? Why?

   integer
   6_05
   month
   XxX
   a$
   _count
   file extension
   file_extension
   FILENAME
   _100

2. Which of the following are invalid constants? Why?

   123.456
   +1.23e+02
   0005
   +.00004
   e-02
   -1e-1
   2.44  e −03

3. Calculate the results and type of each of the following expressions. Then enter them into a program to verify your answers.

   200 mod 7
   100 / 25 * 4
           ((100.5 as integer) - (50.99 as integer) ) ^ 2
           (1.234e+2 + 2.345e+3)
           2 ^ 0.5  -- what does this do?
           (6 ^ 2 + 8 ^ 2) ^ 0.5
           100.25 + 7.5 div 5 - 29 mod 8

4. Given the following formula for converting degrees Fahrenheit (F) to degrees Celsius (C)

   C = 5 ( (F - 32) / 9

   calculate the equivalent Celsius temperatures for the following Fahrenheit temperatures:

   100° F
           32° F
           0° F
           55° F

   First perform the calculation using the formula. Then use the built-in classes degrees Fahrenheit and degrees Celsius to do the conversions.

5. Write a program that evaluates the following expression:

   (3.31 ( 10-8 + 2.01 ( 10-7) / (7.16 ( 10-6 + 2.01 ( 10-8)

6. To round off an integer i to the next largest even multiple of another integer j, the following formula can be used:

   NextMultiple = i + j - i mod j

   For example, to round off 256 days to the next largest number of days evenly divisible by a week, values of i = 256 and j = 7 can be substituted into the preceding formula as follows:

   NextMultiple   =   256 + 7 - 256 mod 7
                  =   256 + 7 - 4
                  =   259

   Write a program to find the next largest even multiple for the following values of i and j:

   i j ...