C++ Institute CPA-21-02 問題集

質問 1：
Which code, inserted at line 18, generates the output "AB"
#include <iostream>
using namespace std;
class A
{
public:
void Print(){ cout<< "A";}
void Print2(){ cout<< "a";}
};
class B:public A
{
public:
void Print(){ cout<< "B";}
void Print2(){ cout<< "b";}
};
int main()
{
B ob2;
//insert code here
ob2.Print();
}
A. ob2?>B::Print();
B. ob2?>A::Print();
C. ob2.B::Print();
D. ob2.A::Print();
正解：D

質問 2：
What happens when you attempt to compile and run the following code?
#include <iostream>
#include <string>
using namespace std;
int f(int i, int b);
int main()
{
int i=0;
i++;
for (i=0; i<=2; i++)
{
cout<<f(0,i);
}
return 0;
}
int f(int a, int b)
{
return a+b;
}
A. It prints: 012
B. It prints: 202020
C. It prints: 2
D. It prints: 0
正解：A

質問 3：
What happens when you attempt to compile and run the following code?
#include <iostream>
using namespace std;
void fun(int &i);
int main()
{
int i=2;
fun(i);
cout<<i;
return 0;
}
void fun(int &i)
{
i+=2;
}
A. It prints: 4
B. It prints: 16
C. It prints: 2
D. It prints: 0
正解：A

質問 4：
What happens when you attempt to compile and run the following code?
#include <iostream>
#include <string>
using namespace std;
class A {
int x;
protected:
int y;
public:
int z;
A() { x=1; y=2; z=3; }
};
class B : public A {
string z;
public:
void set() { y = 4; z = "John"; }
void Print() { cout << y << A::z; }
};
int main () {
B b;
b.set();
b.Print();
return 0;
}
A. It prints: 43
B. It prints: 4John
C. It prints: 23
D. It prints: 2John
正解：A

質問 5：
What will happen when you attempt to compile and run the following code?
#include <iostream>
#include <string>
using namespace std;
string fun(string, string);
int main()
{
string s="Hello";
cout << fun(s, " World");
return 0;
}
string fun(string s1, string s2)
{
return s1+s2;
}
A. It will print: World
B. It will print: HW
C. It will print: Hello World
D. It will print: Hello
正解：C