Answer:
There are some syntax errors:
int myPay, yourPay; // OK
long good-by ; // bad identifier: "-" not allowed
short shrift = 0; // OK
double bubble = 0, toil= 9, trouble = 8 // missing ";" at end.
byte the bullet ; // bad identifier: can't contain a space
int double; // bad identifier: double is a reserved word
char thisMustBeTooLong ; // OK in syntax, but a poor choice
// for a variable name
int 8ball; // bad identifier: can't start with a digit
float a=12.3; b=67.5; c= -45.44; // bad syntax: don't use ";" to separate variables
Example Program
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) );
}
}
The example program,
contains three variable declarations.
The variables are given initial values.
The character * means multiply.
In the program,
(hoursWorked * payRate)
means to
multiply the number stored in hoursWorked
by the number stored in payRate.
Important Idea:
When used as part of an expression,
the name of a variable represents the value it holds.
(An expression is a part of a statement that asks for a value to be calculated.)
When it follows a character string,
+ means to
add characters to the end of the character string. So
"Hours Worked: " + hoursWorked
makes a
character string starting with "Hours Worked: " and ending with
characters for the value of hoursWorked.
The program prints:
Hours Worked: 40
pay Amount : 400.0
tax Amount : 40.0
Remember that if you want to see this program run,
copy it from your Web browser, paste it into Notepad or other text editor,
save it to a file, compile, and run it.
QUESTION 7:
Why did the program print the first 40 without a decimal point,
but printed the
second one with a decimal point as 40.0 ?
(Hint: look at the variable declarations.)
