Java Reference
In-Depth Information
151
Figure 2
Analyzing an Expression
S
ELF
C
HECK
8.
What is the value of
1729 / 100?
Of
1729 % 100?
9.
Why doesn't the following statement compute the average of
s1, s2
,
and
s3
?
double average = s1 + s2 + s3 / 3;
// Error
10.
What is the value of
Math.sqrt(Math.pow(x, 2) +
Math.pow(y, 2))
in mathematical notation?
C
OMMON
E
RROR
4.1: Integer Division
It is unfortunate that Java uses the same symbol, namely /, for both integer and
floating-point division. These are really quite different operations. It is a common
error to use integer division by accident. Consider this program segment that
computes the average of three integers.
int s1 = 5; //
Score of test 1
int s2 = 6; //
Score of test 2
int s3 = 3; //
Score of test 3
double average = (s1 + s2 + s3) / 3;
//
Error
