Chapter 3

   

Java™ 2 Primer Plus
By Steven Haines, Steve Potts

Table of Contents
Appendix C.  Answers to Review Questions


A1:

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

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

A2:

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

A3:

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

A4:

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

A5:

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

A6:

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

A7:

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

A8:

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

A9:

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

A10:

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 


       
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    Java 2 Primer Plus
    Java 2 Primer Plus
    ISBN: 0672324156
    EAN: 2147483647
    Year: 2001
    Pages: 332

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