Why did the program print the first 40 without a decimal point,
but printed the
second one with a decimal point as 40.0 ?
Answer:
The first value was stored in a variable of data type long,
an integer type.
Integers do not have fractional parts.
The second forty was the result of a calculation involving a
variable of data type double,
a floating point type.
Calculation
Here is the program again:
class Example
{
public static void main ( String[] args )
{
long hoursWorked = 40;
double payRate = 10.0, taxRate = 0.10;
System.out.println("Hours Worked: " + hoursWorked );
System.out.println("pay Amount : " + (hoursWorked * payRate) );
System.out.println("tax Amount : " + (hoursWorked * payRate * taxRate) );
}
}
Look carefully at the statement highlighted in red. The parentheses around
(hoursWorked * payRate)
force the multiplication to be done first.
After it is done, the
result is converted to characters and appended to the string
When you have a calculation as part of a
System.out.println()
QUESTION 8:
Would it be convenient to write some of those statements on two lines?