Chapter 4 slides

Question 1

express exponent?

Answer 1

Math.exp(double a)

Question 2

express natural log?

Answer 2

Math.log(double a)

Question 3

express 10 based log?

Answer 3

Math.log10(double a)

Question 4

express power?

Answer 4

Math,pow(double a, double b)

Question 5

express square root?

Answer 5

Math.sqrt(double a)

Question 6

round up to nearest integer?

Answer 6

Math.ceil(double a)

Question 7

round down to nearest integer?

Answer 7

Math.floor(double a)

Question 8

round to nearest integer?

Answer 8

Math.rint(double a)

Question 9

return the max of two parameters?

Answer 9

Math.max(a, b)

Question 10

return the minimum of two parameters?

Answer 10

Math.min(a,b)

Question 11

return the absolute value of a parameter?

Answer 11

Math.abs(a)

Question 12

generate a random double value greater than or equal to one parameter and less than another parameter?

Answer 12

a + Math.random() * b

Question 13

Unicode

Answer 13

16 bit encoding scheme which takes two bytes, preceded by /u, expressed in four hexadecimal numbers that run from \u0000 to \uFFFF, so unicode can represent 65535 + 1 characters

Question 14

ASCII code - ‘0’ to ‘9’

Answer 14

code value in decimal = 48 to 57
Unicode value = \uu30 to /uu0039

Question 15

ASCII code ‘A’ to ‘Z’

Answer 15

code value in decimal = 65 to 90
Unicode value = \u0041 to \u005A

Question 16

ASCII code ‘a’ to ‘z’

Answer 16

code value in decimal = 97 to 122
Unicode value = \u0061 to \u007A

Question 17

isDigit(ch)

Answer 17

returns true if the specified character is a digit

Question 18

isLetter(ch)

Answer 18

returns true if the specified character is a letter

Question 19

isLetterOfDigit

Answer 19

returns true of the specified character is a letter or digit

Question 20

isLowerCase(ch)

Answer 20

returns true if the specified character is a lowercase letter

Question 21

isUpperCase(ch)

Answer 21

returns true if the specified character is an upper character

Question 22

toUpperCase(ch)

Answer 22

returns the uppercase of the specified character

Question 23

to represent a string of characters, use…

Answer 23

a String, ex. String message = “Welcome to Java”

Question 24

length()

Answer 24

returns the number of characters in this string

Question 25

charAt(index)

Answer 25

returns the character at the specified index from this string

Question 26

concat(s1)

Answer 26

returns a new string that concatenates this string with string s1

Question 27

toUpperCase()

Answer 27

returns a new string with all letters in uppercase

Question 28

toLowerCase()

Answer 28

returns a new string with all letters in lowercase