Java Reference
In-Depth Information
1.7
(
Approximate
p
)
p
can be computed using the following formula:
1
3
+
1
5
-
1
7
+
1
9
-
1
11
+ c
p =
4
*
¢
1
-
≤
1
3
+
1
5
-
1
7
+
1
9
-
1
11
Write a program that displays the result of 4
*
¢
1
-
≤
1
3
+
1
5
-
1
7
+
1
9
-
1
11
+
1
13
and 4
*
¢
1
-
≤
. Use
1.0
instead of
1
in your
program.
1.8
(
Area and perimeter of a circle
) Write a program that displays the area and perim-
eter of a circle that has a radius of
5.5
using the following formula:
perimeter
=
2
*
radius
* p
area
=
radius
*
radius
* p
1.9
(
Area and perimeter of a rectangle
) Write a program that displays the area and
perimeter of a rectangle with the width of
4.5
and height of
7.9
using the following
formula:
area
=
width
*
height
1.10
(
Average speed in miles
) Assume a runner runs
14
kilometers in
45
minutes and
30
seconds. Write a program that displays the average speed in miles per hour. (Note
that
1
mile is
1.6
kilometers.)
*
1.11
(
Population projection
) The U.S. Census Bureau projects population based on the
following assumptions:
One birth every 7 seconds
■
One death every 13 seconds
■
One new immigrant every 45 seconds
■
Write a program to display the population for each of the next five years. Assume the
current population is 312,032,486 and one year has 365 days.
Hint
: In Java, if two
integers perform division, the result is an integer. The fractional part is truncated. For
example,
5
/
4
is
1
(not
1.25
) and
10
/
4
is
2
(not
2.5
). To get an accurate result with
the fractional part, one of the values involved in the division must be a number with a
decimal point. For example,
5.0
/
4
is
1.25
and
10
/
4.0
is
2.5
.
1.12
(
Average speed in kilometers
) Assume a runner runs
24
miles in
1
hour,
40
minutes,
and
35
seconds. Write a program that displays the average speed in kilometers per
hour. (Note that
1
mile is
1.6
kilometers.)
*
1.13
(
Algebra: solve
2
*
2
linear equations
) You can use Cramer's rule to solve the fol-
lowing 2
*
2 system of linear equation:
ax
ed
-
bf
af
-
ec
+
by
=
e
x
=
y
=
cx
+
dy
=
f
ad
-
bc
ad
-
bc
Write a program that solves the following equation and displays the value for
x
and
y
:
3.4
x
+
50.2
y
=
44.5
2.1
x
+
.55
y
=
5.9
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