(4) 1.which value can be added to 1's complement to get 2's complement? (1) -2 (2) -1 (3) +2 (4) +1 答：1's complement的負數 +1 就得到 2'complement的負數 (4) 2.Which of the following memory components has the fastest access speed? (1) SRAM (2) Cache (3) DRAM (4) Register 答：存取速度：Register > Cache > SRAM = DRAM (2) 4.Which of the following is not a binary logic gate? (1) AND gate (2) Tri-state buffer (3) Inverter (4) Half-adder 答：Inverter是not gate吧，half-adder也是邏輯電路組成的吧。 Tri-state buffer 我只知道後面是暫存器~前面那個就不知道了。 (1) 5.Given two 4-bit numbers:0110 and 1011,what is the result of adding them together if they are signed magnitude? (1) 0001 (2) 0011 (3) 1101 (4) 1011 (5) 1001 答：如果1011是用二的補數表示，則為-5 6+(-5) = 1 直接加則是 10001 第一個1溢位刪掉 就是0001 (3) 8.Different parts of the large task may be executed by different processors . What is this architecture? (1) SISD (2) SIMD (3) MIMD (4) MISD (5) none of above (4)10.A linked list has the functions insertAtFront,removeFromFront, insertAtBack,and removeFromBack,which perform operations on nodes exactly as their names describe. Which two functions would most naturally model the operation of a queue? (1) insertAtBack and removeFromBack .(2) inertAtBack and removeFromFront. (3) insertAtFront and removeFromFront.(4) inertAtFront and removeFromBack . 答： 序列是先進先出。所以在頭加入、在尾刪除。 (3)11.If the macro #define RECTANGLE_AREA(x,y)((x)*(y)) has been defined. then the line rectArea = RECTANGLE_AREA( a+4,b+7) ; will be expanded to (1) rectArea = 11 ; (2) rectArea= (a+4*b+7); (3) rectArea = ((a+4)*(b+7)); (4) RECTANGLE_AREA(a+4,b+7); (4)12.Given the preprocessor directive #define HAPPY(x) printf ("happy,"#x"\"); How would you invoke this macro to generate a statement that would print Happy BIRTHDAY (followed by a newline) at execution time? (1) Happy(Birthday) (2) Happy(BIRTHDAY) (3) HAPPY(Birthday) (4) HAPPY(BIRTHDAY) 簡答題： 14. Convert 110101 to hex and decimal. 答：1*2^5 + 1*2^4 + 1*2^2 + 1*2^0 = 53 in decimal 53 = 3*16^1 + 5*16^0 = 35 in hex 15. Suppose a communication line is being used to transmit data serially at 28,800 bps. If a burst of interference lasts 0.01 second, how many data bits would be affected? 答：傳送速率： 28800 bits/每秒 所以0.01秒就有 288 bits被影響無法傳送 16. Suppose a time-sharing operating system is allotting time slices of 50 milliseconds.It normailly takes 8 milliseconds to position a disk's read/write head over the desired track and another 17 milliseconds for the desired data to rotate around to the read/write head. (1)How much of program's time slice can be spent waiting for a read from a disk to take place? (2)If the machine is capable of executing ten instructions each microsecond, how many instructions can be executed during this waiting period? 答：(1)-尋覓時間：8 milliseconds 轉動延遲：17 milliseconds 所以存取時間 = 8+17 = 25 千萬秒 是半個 time slices (2)-25千萬秒 除上 微秒/10 = 25 * 10^7 / 10^(-7) = 25 * 10^14 我是否誤會milliseconds的意思？？ 另外(1)的take place是指？發生？ 17. A hash file using the division hash function,i.e.divided by number of buckets, is to be constructed with 50,51,52,or 53 buckets. Which of these choices is best? Why? 答：53，因為是質數，與0~52皆互質，不會特別容易得到某個餘數。 18. Suppose we have 41 buckets. What is the probability of the first eight entries being placed in empty buckets by the division hash function？ 答： 41*40*39*38*37*36*35*34 / 41^8 19. Is the bubble sort algorithm a P-problem? Why? 答：是，因為泡沫排序法屬於Θ(n^2)，所以是多項式問題。 20. Is the bubble sort algorithm a NP-problem? Why? 答：是，因為任一多項式問題皆可加入非既定指令且不影響其效能。 21. A program performs modules A,B,C, and D. Each has executing time N,NlogN+N,N^2,and 2^N respectively. What is the Big-O complexity of the overall program? 答：A→O(N) B→(NlogN+N) C→(N^2) D→(2^N) 22. Write a recursive function reverse_string to reverse a string by C. For example, char[] = "ABCDEFGH"; printf("%s/n",a); /*"ABCDEFGH*/ reverse_string(a); printf("%s/n",a); /*"HGFEDCBA*/ 答： void reverse_string (chat a[]){ char string[]; int m=0,n=0; while(a[m]!='\0'){ m++; } m--; while(m>=0){ string[n]=a[m] m--; n++; } while(n>=0){ a[n]=string[n] n--; } } -- 以上有錯請指正~ 缺的題目~會在下篇~ --

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