Java Reference
In-Depth Information
7.10
(Sales Commissions)
Use a one-dimensional array to solve the following problem: A com-
pany pays its salespeople on a commission basis. The salespeople receive $200 per week plus 9% of
their gross sales for that week. For example, a salesperson who grosses $5,000 in sales in a week re-
ceives $200 plus 9% of $5,000, or a total of $650. Write an application (using an array of counters)
that determines how many of the salespeople earned salaries in each of the following ranges (assume
that each salesperson's salary is truncated to an integer amount):
a) $200-299
b) $300-399
c) $400-499
d) $500-599
e) $600-699
f) $700-799
g) $800-899
h) $900-999
i) $1,000 and over
Summarize the results in tabular format.
7.11
Write statements that perform the following one-dimensional-array operations:
a) Set the 10 elements of integer array
counts
to zero.
b) Add one to each of the 15 elements of integer array
bonus
.
c) Display the five values of integer array
bestScores
in column format.
7.12
(Duplicate Elimination)
Use a one-dimensional array to solve the following problem:
Write an application that inputs five numbers, each between 10 and 100, inclusive. As each number
is read, display it only if it's not a duplicate of a number already read. Provide for the “worst case,”
in which all five numbers are different. Use the smallest possible array to solve this problem. Display
the complete set of unique values input after the user enters each new value.
7.13
Label the elements of three-by-five two-dimensional array
sales
to indicate the order in
which they're set to zero by the following program segment:
for
(
int
row =
0
; row < sales.length; row++)
{
for
(
int
col =
0
; col < sales[row].length; col++)
{
sales[row][col] =
0
;
}
}
7.14
(Variable-Length Argument List)
Write an application that calculates the product of a series
of integers that are passed to method
product
using a variable-length argument list. Test your meth-
od with several calls, each with a different number of arguments.
7.15
(Command-Line Arguments)
Rewrite Fig. 7.2 so that the size of the array is specified by the
first command-line argument. If no command-line argument is supplied, use 10 as the default size
of the array.
7.16
(Using the Enhanced
for
Statement)
Write an application that uses an enhanced
for
state-
ment to sum the
double
values passed by the command-line arguments. [
Hint:
Use the
static
method
parseDouble
of class
Double
to convert a
String
to a
double
value.]
7.17
(Dice Rolling)
Write an application to simulate the rolling of two dice. The application
should use an object of class
Random
once to roll the first die and again to roll the second die. The
sum of the two values should then be calculated. Each die can show an integer value from 1 to 6, so
the sum of the values will vary from 2 to 12, with 7 being the most frequent sum, and 2 and 12 the
least frequent. Figure 7.28 shows the 36 possible combinations of the two dice. Your application
