Java Reference
In-Depth Information
Try This 2-1
How Far Away Is the Lightning?
In this project, you will create a program that computes how far away, in feet, a listener
is from a lightning strike. Sound travels approximately 1,100 feet per second through air.
Thus, knowing the interval between the time you see a lightning bolt and the time the sound
reaches you enables you to compute the distance to the lightning. For this project, assume
that the time interval is 7.2 seconds.
1.
Create a new file called
Sound.java
.
2.
To compute the distance, you will need to use floating-point values. Why? Because
the time interval, 7.2, has a fractional component. Although it would be permissible
to use a value of type
float
, we will use
double
in the example.
3.
To compute the distance, you will multiply 7.2 by 1,100. You will then assign this
value to a variable.
4.
Finally, you will display the result.
Here is the entire
Sound.java
program listing:
