C# 5.0 Programmer's Reference

118 ❘ CHAPTER 5 Operators
Exercises
1. Can you use both the pre- and post-increment operators on the same variable as in ++x++
If you can’t figure it out, try it and try to understand what Visual Studio tells you about it.
2. Sometimes the conditional and null-coalescing operators can make the code confusing, particularly
if their operands are complicated expressions. Rewrite the following code to use if
statements instead of : and .
amountLabel.ForeColor = (amount < 0) Color.Red : Color.Blue;
Customer orderedBy = customer new Customer();
3. In the section “Comparison Operators” the code for the overloaded == operator does not
check whether both operands are null. Why does it not need to do that
4. Create a subtraction operator for the Complex class described in this chapter.
5. Create a Fraction class and define the * and / operators for it.
6. Create a conversion operator to convert Fraction to double. Is this a widening or
narrowing conversion
7. Create a > operator for the Fraction class.
8. Create an == operator for the Fraction class.
9. Calculate the result of each of the following statements.
a. 1 + 2 * 3 - 4 / 5
b. 9 * 5 / 10
c. 2 * 5 / 10
d. 2 / 10 * 5
e. 12 / 6 * 4 / 8
10. Add parentheses to the following expressions to make them true.
a. 4 * 4 - 4 / 4 + 4 = 19
b. 4 * 4 - 4 / 4 + 4 = 16
c. 4 * 4 - 4 / 4 + 4 = 11
d. 4 * 4 - 4 / 4 + 4 = 4
e. 4 * 4 - 4 / 4 + 4 = 0
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