德尔福笔试（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
b) 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:
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 revocations
b) 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.
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 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