Delphi各类型笔试题目

Delphi各类型笔试题目,标签：德勤笔试经验,银行笔试经验,http://www.qz26.com

　　(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 wit

　　hin that module

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

　　ons within that module

　　6. Embedded systems always require the user to manipulate bits in register

　　s 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 bo

　　th 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) (x*x)

　　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 divide 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 divide a number by 4 in assembly language

　　18. what value is stored in m in the following assembly language code frag

　　ment 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 365*24*60*60

　　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, ma

　　ny compiler vendors offer an extension to standard C to support interrupts. Ty

　　pically, the keyword is __interrupt. The following routine (ISR). Point out pr

　　oblems in the code.

　　__interrupt double compute_area (double radius)

　　{

　　double area = PI * radius * radius;

　　printf(“\nArea = %f”, area);

　　return area;

　　}

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