Java 2 Primer Plus

The modulus operator (%) returns the remainder of integer division:

10 % 3 = 1, or explicitly 10 / 3 = 3 with remainder 1

The && operator is the logical AND and is used in Boolean operations that compare two values, for example:

if( a > 5 && a < 10 ) ...

This will evaluate to true only with a value between 5 and 10.

The & operator is the bitwise AND and is used when performing the bitwise AND of type numbers. For example:

3 & 9 = 1, or explicitly 0000 0011 & 0000 1001 = 0000 0001

A truth table is a list of all possible input values and their corresponding values. For example the truth table for the AND operation is

A B Result

0 0 0

0 1 0

1 0 0

1 1 1

21 & 3 == 0001 0101 & 0000 0011 = 0000 0001 = 1 (AND)

21 | 3 == 0001 0101 | 0000 0011 = 0001 0111 = 23 (OR)

21 ^ 3 = 0001 0101 ^ 0000 0011 = 0001 0110 = 22 (XOR)

>> is right shift while >>> is right shift fill with 0s. >> fills with the left most bit.

5 * 5 + 5 is equivalent to ( 5 * 5 ) + 5 = 25 + 5 = 30

5 + 5 * 5 is equivalent to 5 + ( 5 * 5 ) = 5 + 25 = 30

Evaluate the following:

int a = 5; a += 6 * ++a / 2 6 * 9 + 2 a += ( ( ( 6 * ++5 ) / 2 ) (6 * 9) ) + 2 = a += ( ( ( 6 * 6 ) / 2 ) (6 * 9) ) + 2 = a += ( ( ( 36 ) / 2 ) (54) ) + 2 = a += ( 18 54 ) + 2 = a += ( 36 ) + 2 = a += -34 = a = a 34 = a = 5 34 = a = -29