疊拓測試筆試題

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Instructions
Please answer following questions in English, you can only use less than 60 minutes for this test

1. Preprocessor 10 points)
a) Please define a Macro by using preprocess instruction #define in 16-bit machine, the constant is used to indicate how many seconds in one year. (To ignore the leap year)

#define SEC_PER_YEAR (365*24*60*60UL)
(Note: If you define it to be (365*24*60*60)UL, you maybe find that it does not compile well.)

b) Please define a Macro, which is used to compare two parameters and return the smaller parameter.

#define MIN(a, b) ((a)<=(b)?(a):(b))

2. What is the problem of the below code (5 points)
#include <string.h>
char* Func( void )
{
char p[10];
strcpy( p, "111" );
return p;
}

This function can not return the string of “111”.

3. Data declarations (10 points)
Please define a variable according to the below requirement, for example
Requirement: An integer
Answer: int a;

a) A pointer to an integer (1 point)
int *a;

b) A pointer to a pointer to an integer (1 point)
int **a;

c) An array of 10 integers (1 point)
int a[10];

d) An array of 10 pointers to integers (1 point)
int *a[10];

e) A pointer to an array of 10 integers (2 points)
int (*a)[10];

f) A pointer to a function that takes an integer as an argument and returns an integer (2 points)
int (*a)(int)

g) An array of ten pointers to functions that take an integer argument and return an integer (2 points)
int (*a[10])(int)

4. What’s the output of the function and why? (6 points)
void foo(void)
{
unsigned int a = 6;
int b = -20;
(a+b > 6) ? puts("> 6") : puts("<= 6");
}

Result:“>6”
Reason: When a variable of integer operates with a variable of unsigned integer, the integer will be automatically converted to unsigned integer, so the “-20” will be converted to be a large unsigned integer.

5. Const (9 points)
In the following codes, there are some “const”, what is meaning of each them?

a) const char *pa;
The content of pa is read-only.

b) char * const pc = &ca;
The address of pc is read-only.

c) const char * const pd = &cb;
Both the address and content of pd are read-only.

6. Accessing fixed memory locations (10 points)
Please make out a few lines of C codes for accessing a fixed memory location. Requirement is to write an int variable 0xaa55 into the fixed address 0x67a9.

int *p;
p = (int *)0x67a9;
*p = 0xaa55;

7. Typedef (10 points)
Typedef is used to define a new structure which can replace the old structure.
You can also use preprocessor for the same things. But there must be difference between them, so please think of the below code, and answer what is the difference?

#define dPS struct s *
typedef struct s * tPS;

I will declare two object variables for them, such as:
dPS test1, test2;
tPS test3, test4;

You will understand what’s the differences.
1. test1 is a pointer object of struct s, but test2 is not, it is object of struct s.
2. both test3 and test4 are pointer object of struct s.

8. What’s the output of the code? (10 points)
1） #include <iostream>
using namespace std;

class Base
{
public:
virtual void f(float x){ cout << "Base::f(float) " << x << endl; }
void g(float x){ cout << "Base::g(float) " << x << endl; }
void h(float x){ cout << "Base::h(float) " << x << endl; }
};

class Derived : public Base
{
public:
virtual void f(float x){ cout << "Derived::f(float) " << x << endl; }
void g(int x){ cout << "Derived::g(int) " << x << endl; }
void h(float x){ cout << "Derived::h(float) " << x << endl; }
};

void main(void)
{
Derived d;
Base *pb = &d;
Derived *pd = &d;
pb->f(3.14f);
pd->f(3.14f);
pb->g(3.14f);
pd->g(3.14f);
pb->h(3.14f);
pd->h(3.14f);
}

Result:
Derived::f(float) 3.14
Derived::f(float) 3.14
Base::g(float) 3.14
Derived::g(int) 3.14
Base::h(float) 3.14
Derived::h(float) 3.14

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