dc = 1.5
dd = -0.5
de = 0.5
The Modulus Operator
The modulus operator, %, returns the remainder of a division operation. It can be applied to
floating-point types as well as integer types. The following example program demonstrates
the %:
// Demonstrate the % operator.
class Modulus {
public static void main(String args[]) {
int x = 42;
double y = 42.25;
System.out.println("x mod 10 = " + x % 10);
System.out.println("y mod 10 = " + y % 10);
}
}
When you run this program, you will get the following output:
x mod 10 = 2
y mod 10 = 2.25
Arithmetic Compound Assignment Operators
Java provides special operators that can be used to combine an arithmetic operation with
an assignment. As you probably know, statements like the following are quite common in
programming:
a = a + 4;
In Java, you can rewrite this statement as shown here:
a += 4;
This version uses the += compound assignment operator. Both statements perform the same
action: they increase the value of a by 4.
Here is another example,
a = a % 2;
which can be expressed as
a %= 2;
In this case, the %= obtains the remainder of a/2 and puts that result back into a.
There are compound assignment operators for all of the arithmetic, binary operators.
Thus, any statement of the form
var = var op expression;
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