Chapter 2

Page 12

1. Binary to hexadecimal

   • 0100 0101 0110 0111 = 4567
   • 1000 1001 1010 1011 = 89ab
   • 1111 1110 1101 1100 = fedc
   • 0000 0010 0101 0010 = 0252

2. Hexadecimal to binary

   • 83af = 1000 0011 1010 1111
   • 9001 = 1001 0000 0000 0001
   • aaaa = 1010 1010 1010 1010
   • 5555 = 0101 0101 0101 0101
3. Number of bits
   • ffffffff, 32 bits
   • 7fff58b7def0, 48 bit
   • 1111 in binary is 4 bits
   • 1111 in hexadecimal is 16 bits
4. Number of hexadecimal digits
   • 8 bits, 2 hex digits
   • 32 bits, 8 hex digits
   • 64 bits, 16 hex digits
   • 10 bits, 3 hex digits
   • 20 bits, 5 hex digits
   • 7 bits, 2 hex digits

Page 15

1. r = 10, n = 8, d₇ = 2, d₆ = 9, d₅ = 4, d₄ = 5, d₃ = 8, d₂ = 2, d₁ = 5, d₀ = 4 and r = 16, n = 8, d₇ = 2, d₆ = 9, d₅ = 4, d₄ = 5, d₃ = 8, d₂ = 2, d₁ = 5, d₀ = 4

2. Binary to decimal
   • 1010 1010 = 170
   • 0101 0101 = 85
   • 1111 0000 = 240
   • 0000 1111 = 15
   • 1000 0000 = 128
   • 0110 0011 = 99
   • 0111 1011 = 123
   • 1111 1111 = 255
3. Binary to decimal
   • 1010 1011 1100 1101 = 43981
   • 0001 0011 0011 0100 = 4916
   • 1111 1110 1101 1100 = 65244
   • 0000 0111 1101 1111 = 2015
   • 1000 0000 0000 0000 = 32768
   • 0000 0100 0000 0000 = 1024
   • 0111 1011 1010 1010 = 31658
   • 0011 0000 0011 1001 = 12345
4. Hexadecimal to decimal
   • a000 = 40960
   • ffff = 65535
   • 0400 = 1024
   • 1111 = 4369
   • 8888 = 34952
   • 0190 = 400
   • abcd = 43981
   • 5555 = 21845

Page 18

1. Unsigned decimal to hexadecimal
   • 100 = 64
   • 123 = 7b
   • 10 = 0a
   • 88 = 58
   • 255 = ff
   • 16 = 10
   • 32 = 20
   • 128 = 80
2. Unsignged decimal to hexadecimal
   • 1024 = 0400
   • 1000 = 03e8
   • 32768 = 8000
   • 32767 = 7fff
   • 256 = 0100
   • 65535 = ffff
   • 4660 = 1234
   • 43981 = abcd

Page 22

1. Uppercase A - F
   • A: 0x41
   • B: 0x42
   • C: 0x43
   • D: 0x44
   • E: 0x45
   • F: 0x46

2. Lowercase

   char	code	char	code	char	code	char	code	char	code
   a	0x61	g	0x67	m	0x6d	s	0x73	y	0x79
   b	0x62	h	0x68	n	0x6e	t	0x74	z	0x7a
   c	0x63	i	0x69	o	0x6f	u	0x75
   d	0x64	j	0x6a	p	0x70	v	0x76
   e	0x65	k	0x6b	q	0x71	w	0x77
   f	0x66	l	0x6c	r	0x72	x	0x78

3. Uppercase

   char	code	char	code	char	code	char	code	char	code
   A	0x41	G	0x47	M	0x4d	S	0x53	Y	0x59
   B	0x42	H	0x48	N	0x4e	T	0x54	Z	0x5a
   C	0x43	I	0x49	O	0x4f	U	0x55
   D	0x44	J	0x4a	P	0x50	V	0x56
   E	0x45	K	0x4b	Q	0x51	W	0x57
   F	0x46	L	0x4c	R	0x52	X	0x58

4. Punctuation

   char	code	char	code	char	code	char	code	char	code
   spc	0x20	’	0x27	.	0x2e	?	0x3f	`	0x60
   !	0x21	(	0x28	/	0x2f	@	0x40	{	0x7b
   ”	0x22	)	0x29	:	0x3a	[	0x5b	}	0x7c
   #	0x23	*	0x2a	;	0x3b	\	0x5c	|	0x7d
   $	0x24	+	0x2b	<	0x3c	]	0x5d	~	0x7e
   %	0x25	,	0x2c	=	0x3d	^	0x5e
   &	0x26	-	0x2d	>	0x3e	_	0x5f

Page 30

1. /* dec2Hex.c
   * Converts from decimal to hexadecimal
    */
   
   #include <stdio.h>
   
   int main(void)
   {
   unsigned int value;
   
   printf("Decimal: ");
   scanf("%u", &value);
   printf("%u = 0x%02x\n", value, value);
   
   return 0;
   }
   

2. /* hex2Dec.c
   * Converts from hexadecimal to decimal
   */
   
   #include <stdio.h>
   
   int main(void)
   {
   unsigned int value;
   
   printf("Hexadecimal: ");
   scanf("%x", &value);
   printf("0x%02x = %u\n", value, value);
   
   return 0;
   }
   
   

3. The integer is -1, and the string is 0xffffffff.