data types

Question 1

what is an integer?

Answer 1

a whole number

can be negative

Question 2

what is a real? /float

Answer 2

positive or negative numbers that can (not always) have a fractional part

Question 3

what is a character? /char

Answer 3

single symbol

can be: letters, numbers, symbols

Question 4

what is a string?

Answer 4

a collection of characters

Question 5

what is boolean?

Answer 5

true or false

Question 6

binary to decimal

Answer 6

add the numbers with 1

Question 7

denery to binary

Answer 7

write only the binary digits below the denery number

from left, if the digit goes into the denery replace it with a 1 and subtract it from the decimal

if they ask for bytes add necessary 0s from the left

Question 8

binary addition

Answer 8

1 + 1 = 0 carry 1
1 + 0 =1
0 + 0 =0

Question 9

hexadecimal comparison

Answer 9

0-9 decimal = 0-9 hex
10-15 decimal = A-F hex

Question 10

hexadecimal to decimal

Answer 10

from left to right the hex numbers are 16^0, 16^1, 16^2, 16^3

X the answers to those by the corresponding decimal for the hex digit

add all together

Question 11

what does hexadecimal always start with

Answer 11

16^0

Question 12

hexadecimal to binary

Answer 12

split the hex apart

convert the hex’s to corresponding decimals

convert the decimals to binary nibbles

put back together

Question 13

what is ASCII

Answer 13

-american standard code for information exchange
-keyboard character set
-uses 7 bits to represent 128 different characters including capital, small letters, numbers, symbols

Question 14

what is Unicode?

Answer 14

-solves the problem of ASCIIs limited character set
-uses a varying number of bits allowing for over 1 million different characters
-represents characters that haven’t been allocated yet and also other languages