上海龙凤1314 shlf德尔福笔试题目（软件类）
德尔福软件方向的笔试题
１．How do you code an infinite loop in C?
2. Volatile：
a) What does the keyword volatile mean? Give an example
上海龙凤1314 shlfb) Can a parameter be both const and volatile? Give an example
c) Can a pointer be volatile? Give an example
3. What are the values of a, b, and c after the following instructions:
上海龙凤1314 shlfint a=5, b=7, c;
c = a+++b;
4, What do the following declarations mean?
a) const int a;
上海龙凤1314 shlfb) int const a;
上海龙凤1314 shlfc) const int *a;
d) int * const a;
上海龙凤1314 shlfe) 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 revocations
上海龙凤1314 shlfb) Within a module: A static variable is accessible by all functions within that module
c) 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.
上海龙凤1314 shlfThe first should set bit 5 of a. The second shnuld clear bit 5 of a. In both cases, the remaining bits should be unmodified.
上海龙凤1314 shlf7. What does the following function return?
char foo(void)
{
unsigned int a = 6;
上海龙凤1314 shlfiht b = -20;
char c;
上海龙凤1314 shlf(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()
{
上海龙凤1314 shlfint 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);
上海龙凤1314 shlfprintf("%d %d",j,k);
}
12. Simplify the following Boolean expression!((i ==12) || (j > 15))
上海龙凤1314 shlf13. How many flip-flop circuits are needed to divide by 16?
上海龙凤1314 shlf14. Provides 3 properties that make an OS, a RTOS?
上海龙凤1314 shlf15. 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
上海龙凤1314 shlfLOOP: MVI C,78H
DCR C
JNZ LOOP
HLT
上海龙凤1314 shlfHow 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 language
19.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 the number of seconds in a year? Disregard leap years in your answer.
22. 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 followingroutine (ISR). Point out problems in the code.__interrupt double compute_area (double radius)
{
上海龙凤1314 shlfdouble area = PI * radius * radius;
printf(" Area = %f", area);
return area;
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