Chapter 4.3 Characters

Question 1

Character definition

Answer 1

A character is a single character.
A character literal is enclosed in matching single quotes (‘).
ex.
char letter = ‘A’;
char numChar = ‘4’;

Question 2

ASCII code values in decimal and unicode for characters ‘0’ to ‘9’

Answer 2

48-57
\u0030 to \u0039

char numChar = (char)52; // ’4’

Question 3

ASCII code values in decimal and unicode for characters ‘A’ to ‘Z’

Answer 3

65-90
\u0041 to \u005A

char letter = (char)65; // ’A’
\

Question 4

ASCII code values in decimal and unicode for characters ‘a’ to ‘z’

Answer 4

97-122
\u0061 to \u007A

Question 5

How many bytes does unicode take

What is the range of the highest to lowest unicode value

Answer 5

two bytes

‘\u0000’ to ‘\uFFFF’

Question 6

Escape character for Characters: backspace

Answer 6

\b
\u0008
8

Question 7

Escape character for Characters: tab

Answer 7

\t
\u0009
9

Question 8

Escape character for Characters: linefeed

Answer 8

\n
\u000A
10

Question 9

Escape character for Characters: formfeed

Answer 9

\f
\u000D
13

Question 10

Escape character for Characters: carriage return

Answer 10

\r
\u000D
13

Question 11

Escape character for Characters: backlash

Answer 11

\u005C
92

Question 12

Escape character for Characters: double quote

Answer 12

"
\u0022
34

Question 13

char ch = ‘a’;
ch++;
System.out.println(ch);

what prints?

Answer 13

b

Question 14

How to convert a character to an int type to perform character arithmetic

Answer 14

c = (char) (c+1);

Question 15

Given the statement
char x = ‘7’;
then the statement
int i = (int)(x - ‘0’);

what is the value of i

Answer 15

will assign to i the value 7 because the difference between the encoding of ‘7’ and the encoding of ‘0’ is 7.

Question 16

‘a’ < ‘b’ true or false

Answer 16

//true because the Unicode for ‘a’ (97) is less than the Unicode for ‘b’ (98).

Question 17

‘a’ < ‘A’
t or f

Answer 17

//false because the Unicode for ‘a’ (97) is greater than the Unicode for ‘A’ (65).

Question 18

‘1’ < ‘8’
t or f

Answer 18

//true because the Unicode for ‘1’ (49) is less than the Unicode for ‘8’ (56).

Question 19

Character method to: return true if the specified character is a digit

Answer 19

isDigit(ch)

Question 20

Character method to: return true if the specified character is a letter

Answer 20

isLetter(ch)

Question 21

Character method to: return true if the specified character is a letter or digit

Answer 21

isLetterOrDigit(ch)

Question 22

Character method to: return true if the specified character is a lowercase letter

Answer 22

isLowerCase(ch)

Question 23

Character method to: return true if the specified character is an uppercase letter

Answer 23

isUpperCase(ch)

Question 24

Character method to: return the lowercase of the specified character

Answer 24

toLowerCase(ch)

Question 25

Character method to: return the uppercase of the specified character

Answer 25

toUpperCase(ch)