R 69 Character Sets Ascii Test Template
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4Character Sets – ASCII - Reading
R 69
Computers only store 0s and 1s. Humans, though, want to read and write with letters of the
alphabet. We therefore need a way of converting letters, known as characters, into binary.
To do this we use a character set. This is a set of characters along with the binary code that
represents each one.
A common character set is ASCII, pronounced ASS-KEY. It stands for American Standard Code for
Information Interchange. ASCII was developed in the late 1960s and so many of the characters are
obsolete today. It uses 7 bits to encode up to 128 characters. Extended ASCII uses 8 bits (1 byte) to
encode up to 256 characters (from 0~255).
The following table shows some of the ASCII and extended ASCII character set.
ASCII from 32~111
Binary
Char
Binary
Char
Binary
Char
Binary
Char
Binary
Char
0010 0000
Space
0011 0000
0
0100 0000
@
0101 0000
P
0110 0000
`
0010 0001
!
0011 0001
1
0100 0001
A
0101 0001
Q
0110 0001
a
0010 0010
“
0011 0010
2
0100 0010
B
0101 0010
R
0110 0010
b
0010 0011
#
0011 0011
3
0100 0011
C
0101 0011
S
0110 0011
c
0010 0100
$
0011 0100
4
0100 0100
D
0101 0100
T
0110 0100
d
0010 0101
%
0011 0101
5
0100 0101
E
0101 0101
U
0110 0101
e
0010 0110
&
0011 0110
6
0100 0110
F
0101 0110
V
0110 0110
f
0010 0111
‘
0011 0111
7
0100 0111
G
0101 0111
W
0110 0111
g
0010 1000
(
0011 1000
8
0100 1000
H
0101 1000
X
0110 1000
h
0010 1001
)
0011 1001
9
0100 1001
I
0101 1001
Y
0110 1001
i
0010 1010
*
0011 1010
:
0100 1010
J
0101 1010
Z
0110 1010
j
0010 1011
+
0011 1011
;
0100 1011
K
0101 1011
[
0110 1011
k
0010 1100
,
0011 1100
<
0100 1100
L
0101 1100
0110 1100
l
0010 1101
-
0011 1101
=
0100 1101
M
0101 1101
]
0110 1101
m
0010 1110
.
0011 1110
>
0100 1110
N
0101 1110
^
0110 1110
n
0010 1111
/
0011 1111
?
0100 1111
O
0101 1111
_
0110 1111
o
Binary
Char
Binary
Char
0111 0000
p
1110 1000
è
0111 0001
q
1110 1001
é
0111 0010
r
1110 1010
ê
0111 0011
s
1110 1011
ë
Extended ASCII
0111 0100
t
1110 1100
ì
ASCII from
from
0111 0101
u
1110 1101
í
0111 0110
v
1110 1110
î
112~127
232~247
0111 0111
w
1110 1111
ï
0111 1000
x
1111 0000
ð
0111 1001
y
1111 0001
ñ
0111 1010
z
1111 0010
ò
0111 1011
{
1111 0011
ó
0111 1100
|
1111 0100
ô
0111 1101
}
1111 0101
õ
0111 1110
~
1111 0110
ö
0111 1111
DEL
1111 0111
÷
Notice that uppercase letters have a lower binary number than lowercase letters. This means that in
programming it is often true to say that A < a or c < d.
Question: What is the binary value of “K” in ASCII? Answer: 0100 1011
Question: Convert “Happy Birthday!” into binary using ASCII.
Answer:
01001000 01100001 01110000 01110000 01111001 00100000 01000010 01101001
01110010 01110100 01101000 01100100 01100001 01111001 00100001
(The spaces here would not be stored by the computer, it would just be one long sequence of 0s and 1s)
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