ELEMENTARY PROGRAMMING - Introduction to Java Programming: Comprehensive Version - page 56

In this case, i is incremented by 1 , then the old value of i is used in the multiplication. So
newNum becomes 100 . If i++ is replaced by ++i as follows,

int i = 10 ;
int newNum = 10 * (++i);

Same effect as

i = i + 1 ;
int newNum = 10 * i;

System.out.print("i is " + i
+ ", newNum is " + newNum);

i is 11, newNum is 110

i is incremented by 1 , and the new value of i is used in the multiplication. Thus newNum
becomes 110 .
Here is another example:

double x = 1.0 ;
double y = 5.0 ;
double z = x-- + (++y);

After all three lines are executed, y becomes 6.0 , z becomes 7.0 , and x becomes 0.0 .

Tip
Using increment and decrement operators makes expressions short, but it also
makes them complex and difficult to read. Avoid using these operators in expres-
sions that modify multiple variables or the same variable multiple times, such as this
one: int k = ++i + i .

2.25

✓ ✓

Which of these statements are true?

Check

Point

a. Any expression can be used as a statement.

b. The expression x++ can be used as a statement.

c. The statement x = x + 5 is also an expression.

d. The statement x = y = x = 0 is illegal.

2.26

Show the output of the following code:

int a = 6 ;
int b = a++;
System.out.println(a);
System.out.println(b);
a = 6 ;
b = ++a;
System.out.println(a);
System.out.println(b);

2.15 Numeric Type Conversions
Floating-point numbers can be converted into integers using explicit casting.
Can you perform binary operations with two operands of different types? Yes. If an integer
and a floating-point number are involved in a binary operation, Java automatically converts
the integer to a floating-point value. So, 3 * 4.5 is same as 3.0 * 4.5 .

Key
Point