課程名稱︰電子計算機概論(期中考)
課程性質︰圖資系必修
課程教師︰黃乾綱
開課系所︰圖資系
考試時間︰2005-11-1
試題 :
共110分
選擇題：(共 10 題；每題 4 分)
Ch2.
（d）1.A gray scale picture is digitized using eight different gray levels.
If the picture is composed of 200*100 pixels, how many bits are need to
represent the picture?
a. 10000
b. 20000
c. 30000
d. 60000
e. none of above
（d）2. How many hexadecimal and octal digits are needed to convert a 6-byte
pattern?
a. 3 , 3
b. 3 ,2
c. 18 , 24
d. 12 , 16
e. none of above
（a）3. In extended ASCII, a _______ of the bit pattern for regular ASCII
code.
a. 0 bit is added to the left
b. 0 bit is added to the right
c. 1 bit is added to the left
d. 1 bit is added to the right
e. none of above
( c ) 4. Transform 830 迳____ with 16bit allocation by sign and magnitude
format
a. 1111110011000000
b. 1111110011000001
c. 0000001100111110
d. 1000001100111110
e. none of above
( b ) 5. Transform -830 迳____ with 16bit allocation by one,s complement
format
a. 1111110011000000
b. 1111110011000001
c. 0000001100111110
d. 1000001100111110
e. none of above
( b ) 6. Transform -831 迳____ with 16bit allocation by two,s complement
format
a. 1111110011000000
b. 1111110011000001
c. 0000001100111110
d. 1000001100111110
e. none of above
（b）7. Change FCE4 16 to __ __ 8 （change the hexadecimal notation to
octal notation）
a. 176343
b. 176344
c. 176345
d. 176346
e. none of above
（a）8. Which one is the result of the following operations：（x99 AND x33）OR
（x00 AND xFF）
a. 00010001
b. 00010000
c. 00010011
d. 00010111
e. none of above
（b）9. You need to flip the 3 rightmost and the 1 leftmost bits of a pattern
，what is the mask and the operation?
a. XOR , 11100001
b. XOR , 10000111
c. AND , 11100001
d. AND , 10000111
e. none of above
（c）10. The _______ method of integer representation is the most common
method to store integers in computer memory,
a. sign-and-magnitude
b. one,s complement
c. two,s complement
d. unsigned integers
e. none of above
二.簡答
1.Explain the situation of "Overflow"(5pt)
2. (chap 3)Change the following decimal fractions into binary fractions,and
further transform it into the binary format of IEEE 754(fingle precision)
(30pt , 10pt for each)
a.
b.
c.
3.Write the range of above format(15pt)
a. sign and magnitude
b. one,s complement
c. two,s complement
4. (chap 1)The von Neumann Model defines a computer as 4 subsystems.(10pt)
a. what are there 4 subsystems?
b. what are the main features of the von Neumann Model?
5. (chap 2,3)Number system conversion:(10pt)
a. (10100101)2 = ( 165 )10
b. (68182)10 = ( 205126 )8
c. (ADC8)16 = ( 44488 )10
d. (420132)10 = ( 001100110100100100100 )2
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