C++ Institute CPA 問題集

質問 1：
What is the output of the program?
#include <iostream> #include <string>
using namespace std;
struct t { int tab[2];
};
class First
{
struct t u;
public:
First() {
u.tab[0] = 1;
u.tab[1] = 0;
}
void Print(){
cout << u.tab[0] << " " << u.tab[1];
}
};
int main()
{
First t;
t.Print();
}
A. It prints: 1 0
B. It prints: 2 2
C. It prints: 0 0
D. It prints: 1 1
正解：A

質問 2：
Which of the following is a correct way to define the function fun() in the program below?
#include <iostream> #include <sstream> #include <string> using namespace std; int main() { int a[2][2]; fun(a); return 0; }
A. void fun(int *p[2][2]) {}
B. void fun(int p[][2]) {}
C. void fun(int *p[2]) {}
D. void fun(int *p[][2]) {}
正解：B

質問 3：
What will the variable "y" be in class B?
class A {
int x;
protected:
int y;
public:
int age;
};
class B : protected A {
string name;
public:
void Print() {
cout << name << age;
}
};
A. public
B. protected
C. None of these
D. private
正解：B

質問 4：
What happens when you attempt to compile and run the following code?
#include <iostream>
using namespace std;
int min(int a, int b);
int main()
{
int b=10;
b = min(5,20);
cout << b;
return 0;
}
int min(int a, int b)
{
if (a<b)
return(a);
else
return(b);
}
A. It prints: 10
B. It prints: 5
C. It prints: 0
D. It prints: 20
正解：B

質問 5：
What happens when you attempt to compile and run the following code?
#include <iostream>
using namespace std;
class A
{
public:
virtual void Print(){ cout<<"A";}
};
class B:public A
{
public:
virtual void Print(){ cout<< "B";}
};
int main()
{
A *obj;
A ob1;
obj = &ob1;
obj->Print();
B ob2;
obj = &ob2;
obj->Print();
}
A. It prints: AA
B. It prints: BA
C. It prints: AB
D. It prints: BB
正解：C

質問 6：
What happens when you attempt to compile and run the following code?
#include <iostream>
using namespace std;
int fun(int x);
int main() {
cout << fun(0);
return 0;
}
int fun(int x) {
if(x > 0)
return fun(x-1);
else
return 100;
}
A. It prints: 10
B. It prints: 0
C. It prints: 100
D. It prints: -1
正解：C

質問 7：
What happens when you attempt to compile and run the following code?
#include <iostream>
#include <string>
using namespace std;
class Second;
class Base {
int age;
public:
Base () { age=5; };
friend void set(Base &ob, Second &so);
void Print() { cout << age;}
};
class Second {
string name;
public:
friend void set(Base &ob, Second &so);
void Print() { cout << name;}
};
void set(Base &ob, Second &so) {
ob.age = 0; so.name = "Bill";
}
int main () {
Base a;
Second b;
set(a,b);
a.Print();
b.Print();
return 0;
}
A. None of these
B. It prints: Bill0
C. It prints: 0Bill
D. Compilation error
正解：C

質問 8：
What happens when you attempt to compile and run the following code?
#include <iostream>
#include <string>
using namespace std;
class A {
public:
int x;
A() { x=0;}
A(int x) { this->x=x;}
};
class B : private A {
public:
using A::x;
B() { x=1;}
B(int x) {this->x = x;}
};
int main () {
B c1;
B c2(?5);
cout << c1.x;
cout << c2.x;
return 0;
}
A. It prints: 1?5
B. It prints: 5
C. It prints: 0
D. It prints: 05
正解：A