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軟件類相關(guān)筆試真題

更新:2023-09-20 00:30:32 高考升學網(wǎng)

  1. How do you code an infinite loop in C?

  2. Volatile:

  (1)What does the keyword volatile mean? Give an example

  (2)Can a parameter be both const and volatile? Give an example

  (3)Can a pointer be volatile? Give an example

  3. What are the values of a, b, and c after the following instructions:

  int a=5, b=7, c;

  c = a+++b;

  4. What do the following declarations mean?

  (1)const int a;

  (2)int const a;

  (3)const int a;

  (4)int const a;

  (5)int const a const;

  5. Which of the following statements describe the use of the keyword static?

  (1)Within the body of a function: A static variable maintains its value between function revocations

  (2)Within a module: A static variable is accessible by all functions within that module

  (3)Within a module: A static function can only be called by other functions within that module

  6. Embedded systems always require the user to manipulate bits in registers or variables. Given an integer variable a, write two code fragments. The first should set bit 5 of a. The second shnuld clear bit 5 of a. In both cases, the remaining bits should be unmodified.

  7. What does the following function return?

  char foo(void)

  {

  unsigned int a = 6;

  iht b = -20;

  char c;

  (a+b > 6) ? (c=1): (c=0);

  return c;

  }

  8. What will be the output of the following C code?

  main()

  {

  int k, num= 30;

  k =(num > 5 ? (num <=10 ? 100:200): 500);

  printf(“%d”, k);

  }

  9. What will the following C code do?

  int ptr;

  ptr =(int )Ox67a9;

  ptr = Oxaa55;

  10. What will be the output of the follow C code?

  #define product(x) (xx)

  main()

  {

  int i = 3, j, k;

  j = product(i++);

  k = product(++i);

  printf(“%d %d”,j,k);

  }

  11. Simplify the following Boolean expression

  !((i ==12) || (j > 15))

  12. How many flip-flop circuits are needed to spanide by 16?

  13. Provides 3 properties that make an OS, a RTOS?

  14. What is pre-emption?

  15. Assume the BC register value is 8538H, and the DE register value is 62 A5H.Find the value of register BC after the following assembly operations:

  MOV A,C

  SUB E

  MOV C,A

  MOV A,B

  SBB D

  MOV B,A

  16. In the Assembly code shown below

  LOOP: MVI C,78H

  DCR C

  JNZ LOOP

  HLT

  How many times is the DCR C Operation executed?

  17. Describe the most efficient way (in term of execution time and code size) to spanide a number by 4 in assembly language

  18. what value is stored in m in the following assembly language code fragment if n=7?

  LDAA #n

  LABEL1: CMPA #5

  BHI L3

  BEQ L2

  DECA

  BRA L1

  LABEL2: CLRA

  LABEL3: STAA #m

  19. What is the state of a process if a resource is not available?

  #define a 365246060

  20. Using the #define statement, how would you declare a manifest constant that returns the number of seconds in a year? Disregard leap years in your answer.

  21. Interrupts are an important part of embedded systems. Consequently, many compiler vendors offer an extension to standard C to support interrupts. Typically, the keyword is __interrupt. The following routine (ISR). Point out problems in the code.

  __interrupt double compute_area (double radius)

  {

  double area = PI radius radius;

  printf(“\nArea = %f”, area);

  return area;

  }

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