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NOTES
[1]  ¶ÌÓïby farÐÞÊαȽϼ¶Óë×î¸ß¼¶£¬Ç¿µ÷ÊýÁ¿¡¢³Ì¶ÈµÈ£¬ÒâΪ¡°¡­¡­µÃ¶à£¬×î¡­¡­¡±£¬ÕâÊÇÒ»¸öÓÃand Á¬½ÓµÄ²¢Áо䡣
[2] to make sureÊDz»¶¨Ê½¶ÌÓï×÷Ä¿µÄ×´ÓÆäºóµÄthatÒýµ¼µÄÊÇmakeµÄ±öÓï´Ó¾ä¡£
KEYWORDS
Binary Coded Decimal£¨BCD£©  ¶þ½øÖƱàÂëµÄÊ®½øÖÆ£¬¶þ-Ê®½øÖÆ
ASCII          ÃÀ¹úÐÅÏ¢½»»»Óñê×¼´úÂë
EBCDIC    À©Õ¹µÄ¶þ-Ê®½øÖƽ»»»Âë
even-parity    ż¼ìÑé
odd-parity        Ææ¼ìÑé
parity checking    Ææż¼ìÑé
EXERCISES
1£®True£¯False£®
£¨1£©______  The possible symbols in the binary numbering system are 0 to 9£®
£¨2£©______The decimal value of 16 is represented in 4 bit BCD as 00010101£®
£¨3£©______Alphanumeric versions of BCD commonly use 7£¬or 8 bits to represent characters£®
£¨4£©______ A 6 bit alphanumeric code can represent 128 different characters£®
£¨5£©______There are four 8 bit codes in current use£®
£¨6£©______ Each 8 bit unit used to code data is called a byte£®
£¨7£©______ Eight bit codes are limited to representing 128 different characters£®
£¨8£©______ An extra check£¨or parity£©bit is often added to each 7£¬or 8 bit character represented in storage so that it will be possible to detect coding errors that may occur£®
£¨9£©______ The digits that can be found in the binary numbering system are only 0s and 1s£®
£¨10______ Using BCD we can convert the entire decimal value into a pure binary form£®
2£®Fill in the blanks with appropriate words or phrases found behind this exercise£®
£¨1£©Every computer stores numbers£¬letters and characters in a ______  form£®
£¨2£©The abbreviation BCB is derived from its full name______£®
£¨3£©Using BCD we can convert each decimal number into its binary______£®
£¨4£©In addition to four numeric place positions in an 8-bit code there are another four     
      ______positions£®
£¨5£©The most popular code used to represent data internally in personal computer is ______£®
£¨6£©The main difference between EBCDIC and ASCII-8 is______ positions£®
£¨7£©Parity checking has two types£¬they are ______£®
£¨8£©Any character can be represented by using just______of 0 and 1£®
  a£®equivalent
  b£®even-parity and odd-parity
  c£®ASCII
  d£®coded
  e£®two digits
  f£®patterns of zone
  g£®zone bit
  h£®binary coded decimal

1£®£¨1£©f  £¨2£©f  £¨3£©t  £¨4£©f£¨5£©f  £¨6£©t  £¨7£©f £¨8£©t£¨9£©t  £¨10£©f

2£®£¨1£©d  £¨2£©h  £¨3£©a  £¨4£©g£¨5£©c  £¨6£©f  £¨7£©b  £¨8£©e