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c.
What is the number of columns in the array
sales
?
d.
To sum the sales by
CAR_TYPES
, what kind of processing is required?
e.
To sum the sales by
COLOR_TYPES
, what kind of processing is required?
30.
Write Java statements that do the following:
a.
Declare an array
alpha
of
10
rows and
20
columns of type
int
.
b.
Initialize each element of the array
alpha
to
5
.
c.
Store
1
in the first row and
2
in the remaining rows.
d.
Store
5
in the first column, and the value in each remaining column is
twice the value of the previous column.
e.
Print the array
alpha
one row per line.
f.
Print the array
alpha
one column per line.
31.
Consider the following declaration:
int
[][] beta =
new int
[3][3];
What is stored in
beta
after each of the following statements executes?
a.
for
(
int
i = 0; i < 3; i++)
for
(
int
j = 0; j < 3; j++)
beta[i][j] = 0;
b.
for
(
int
i = 0; i < 3; i++)
for
(
int
j = 0; j < 3; j++)
beta[i][j] = i + j;
c.
for
(
int
i = 0; i < 3; i++)
for
(
int
j = 0; j < 3; j++)
beta[i][j] = i * j;
d.
for
(
int
i = 0; i < 3; i++)
for
(
int
j = 0; j < 3; j++)
beta[i][j] = 2 * (i + j) % 4;
32.
In Java, as an actual parameter, can an array be passed by value?
33.
Define a two-dimensional array named
temp
of 3 rows and 4 columns of
type
int
such that the first row is initialized to
6
,
8
,
12
,
9
; the second
row is initialized to
17
,
5
,
10
,
6
; and the third row is initialized to
14
,
13
,
16
,
20
.
Suppose that array
temp
is as defined in Exercise 33. Write Java statements
to accomplish the following:
a.
Output the contents of the first row and first column element of
temp
.
b.
Output the contents of the first row and last column element of
temp
.
c.
Output the contents of the last row and first column element of
temp
.
d.
Output the contents of the last row and last column element of
temp
.
34.
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