Java Reference
In-Depth Information
5.4
Find the error in each of the following code segments, and explain how to correct it:
a)
i =
1
;
while
(i <=
10
);
++i;
}
b)
for
(k =
0.1
; k !=
1.0
; k +=
0.1
)
System.out.println(k);
c)
switch
(n)
{
case
1
:
System.out.println(
"The number is 1"
)
;
case
2
:
System.out.println(
"The number is 2"
);
break
;
default
:
System.out.println(
"The number is not 1 or 2"
);
break
;
}
d)
The following code should print the values 1 to 10:
n =
1
;
while
(n <
10
)
System.out.println(n++);
Answers to Self-Review Exercises
5.1
a)
for
,
while
. b) after. c)
switch
. d)
continue
. e)
&&
(conditional AND). f)
false
. g)
static
.
5.2
a) False. The
default
case is optional. If no default action is needed, then there's no need
for a
default
case. b) False. The
break
statement is used to exit the
switch
statement. The
break
statement is not required for the last case in a
switch
statement. c) False.
Both
of the relational ex-
pressions must be true for the entire expression to be true when using the
&&
operator. d) True.
e) True. f) False. The
switch
statement does not provide a mechanism for testing ranges of values,
so every value that must be tested should be listed in a separate
case
label. g) True.
5.3
a)
sum =
0
;
for
(count =
1
; count <=
99
; count +=
2
)
sum += count;
b)
double
result = Math.pow(
2
.
5
,
3
)
;
c)
i =
1
;
while
(i <=
20
)
{
System.out.print(i);
if
(i % 5 ==
0
)
System.out.println();
else
System.out.print(
'\t'
)
;
++i;
}
