德爾福筆試（軟件類）

　　德爾福軟件方向的筆試題

　�。保瓾ow do you code an infinite loop in C?

　　2. Volatile：

　　a) What does the keyword volatile mean? Give an exampleb) Can a parameter be both const and volatile? Give an examplec) Can a pointer be volatile? Give an example3. 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?

　　a) const int a;

　　b) int const a;

　　c) const int *a;

　　d) int * const a;

　　e) int const * a const;

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

　　a) Within the body of a function: A static variable maintains its value　between function revocationsb) Within a module: A static variable is accessible by all functions　within that modulec) Within a module: A static function can only be called by other　functions within that module6. 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 values are printed when the following C program is executed?

　　int i = 8;

　　void main(void)

　　(

　　9. 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);

　　}

　　10. What will the following C code do?

　　int *ptr;

　　ptr =(int *)Ox67a9;

　　ptr = Oxaa55;

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

　　define product(x) (x*x)

　　main()

　　{

　　int i = 3, j, k;

　　j = product(i++);

　　k = product(++i);

　　printf("%d %d",j,k);

　　}

　　12. Simplify the following Boolean expression!((i ==12) || (j > 15))13. How many flip-flop circuits are needed to divide by 16?

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

　　15. What is pre-emption?

　　16. Assume the BC register value is 8538H, and the DE register　value is 62A5H.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

　　17.In the Assembly code shown below

　　LOOP: MVI C,78H

　　DCR C

　　JNZ LOOP

　　HLT

　　How many times is the DCR C Operation executed?

　　18.Describe the most efficient way(in term of execution time　and code size) to divide a number by 4 in assembly language19.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

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

　　define a 365*24*60*60

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

　　22. Interrupts are an important part of embedded　systems. Consequently, many compiler vendorsoffer an extension to standard C to support interrupts.Typically, the keyword is __interrupt. The followingroutine (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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