Data Representation

 

Q-4 Data Representation ASCII with their code and details.

Ans.

The ASCII table has 128 characters, with values from 0 through 127. Thus, 7 bits are sufficient to represent a character in ASCII; however, most computers typically reserve 1 byte, (8 bits), for an ASCII character. One byte allows a numeric range from 0 through 255 which leaves room for growth in the size of the character set, or for a sign bit. Consequently, a character data type may optionally represent signed values; however, for now, we will assume that character data types are unsigned, i.e. positive integer values, in the range 0-127.

 

ASCII code divided in four parts

·         Symbol (33-47) ASCII value.

·         Number (48-57) ASCII value.

·         Upper case character (65 – 90) ASCII value.

·         Lower case character(97 – 122) ASCII value.

 

Symbol E.g.

ASCII	Symbol
33	!
34	“
35	#
36	$
37	%
38	&
39	‘
40	(
41	)
42	*
43	+
44	,
45	-
46	.
47	/

 

Number E.g.

 

ASCII	Symbol
48	0
49	1
50	2
51	3
52	4
53	5
54	6
55	7
56	8
57	9

Upper case and lower case E.g.

ASCII	Symbol	ASCII	Symbol	ASCII	Symbol	ASCII	Symbol
65	A	78	N	97	a	110	n
66	B	79	O	98	b	111	o
67	C	80	P	99	c	112	p
68	D	81	Q	100	d	113	q
69	E	82	R	101	e	114	r
70	F	83	S	102	f	115	s
71	G	84	T	103	g	116	t
72	H	85	U	104	h	117	u
73	I	86	V	105	i	118	v
74	J	87	W	106	j	119	w
75	K	88	X	107	k	120	x
76	L	89	Y	108	l	121	y
77	M	90	Z	109	m	122	z

 

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