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【正文】 ords on a disk Figure The message “ Hello.” in ASCII Representing text ? Each printable character (letter, punctuation, etc.) is assigned a unique bit pattern. ? ASCII = 7bit values for most symbols used in written English text ? Unicode = 16bit values for most symbols used in most world languages today ? ISO proposed standard = 32bit values Representing numeric values ? Binary notation – uses bits to represent a number in base two ? Limitations of puter representations of numeric values ? Overflow – happens when a number is too big to be represented ? Truncation – happens when a number is between two representable numbers Figure The sound wave represented by the sequence 0, , , , , , , , 0 Figure The base ten and binary systems Figure Decoding the binary representation 100101 Figure An algorithm for finding the binary representation of a positive integer Figure Applying the algorithm in Figure to obtain the binary representation of thirteen Figure The binary addition facts Figure Decoding the binary representation Representing Integers ? Unsigned integers can be represented in base two ? Signed integers = numbers that can be positive or negative ? Two’ s plement notation = the most popular representation ? Excess notation = another less popular representation Figure Two’ s plement notation systems Figure Coding the value 6 in two’ s plement notation using four bits Figure Addition problems converted to two’ s plement notation Figure An excess eight conversion table Figure An excess notation system using bit patterns of length three Figure Floatingpoint notation ponents Figure Coding the value 25?8 Figure The ASCII codes for the letters A and F adjusted for odd parity Figure An errorcorrecting code Figure Decoding the pattern 010100 using the code in Figure 謝謝觀看 /歡迎下載 BY FAITH I MEAN A VISION OF GOOD ONE CHERISHES AND THE ENTHUSIASM THAT PUSHES ONE TO SEEK ITS FULFILLMENT REGARDLESS OF OBSTACLES. BY FAITH I BY FAITH
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