Solution to Question 4-1. The
= operator is the assignment operator, used to assign a value to a variable. The
== operator is the equality operator, which tests the equality of two values and returns a Boolean. Confusing the two is a very common mistake, and a common source of errors.
Solution to Question 4-2. To assign the same value to multiple variables, simply chain the assignments, like this:
int a = b = c = d = 36;
Solution to Question 4-3. When you divide two
doubles, the solution has a fractional portion, expressed as a decimal, as you would expect. When you divide two
ints, the compiler discards any fractional remainder.
Solution to Question 4-4. The purpose of the
% operator is to return the remainder from an integer division. It’s very useful in controlling loops, as you’ll see later.
Solution to Question 4-5. The output of the operations is:
4 (Be careful of the order of operations here; the division (
8 / 4) takes place before the addition and the subtraction)
Be sure to take note of the parentheses and the order of operator precedence, as discussed in Operator Precedence.
Solution to Question 4-6. Because the self-assignment operators are used here, the value of
myInt changes with each step, forming a new input for the next step.
myInt += 5; myInt = 30 myInt -= 15; myInt = 15 myInt *= 4; myInt = 60 myInt /= 3; myInt = 20
Solution to Question 4-7. The prefix operator increments (or decrements) the original value, and then assigns the new value ...