8.4 Programming Exercises

Exercise 8-1: Print a checkerboard (8-by-8 grid). Each square should be 5-by-3 characters wide. A 2-by-2 example follows:

+-----+-----+ 
|     |     | 
|     |     | 
|     |     | 
+-----+-----+ 
|     |     | 
|     |     | 
|     |     | 
+-----+-----+ 

Exercise 8-2: The total resistance of n resistors in parallel is:

¹/_R = ¹/_R1 + ¹/_R2 + ¹/_R3 + ... + ¹/_Rn

Suppose we have a network of two resistors with the values 400 and 200. Our equation would be:

¹/_R = ¹/_R1 + ¹/_R2

Substituting in the value of the resistors we get:

¹/_R = ¹/₄₀₀ + ¹/₂₀₀

¹/_R = ³/₄₀₀

R = ⁴⁰⁰/₃

So the total resistance of our two-resistor network is 133.3.

Write a program to compute the total resistance for any number of parallel resistors.

Exercise 8-3: Write a program to average n numbers.

Exercise 8-4: Write a program to print out the multiplication table.

Exercise 8-5: Write a program that reads a character and prints out whether it is a vowel or a consonant.

Exercise 8-6: Write a program that converts numbers to words. Example: 895 results in "eight nine five."

Exercise 8-7: The number 85 is said "eighty-five," not "eight five." Modify the previous program to handle the numbers 0-100 so all numbers come out as we really say them. For example, 13 is "thirteen," and 100 is "one hundred."