C++ Institute CPA 問題集

質問 1：
What happens when you attempt to compile and run the following code?
#include <iostream>
#include <string>
using namespace std;
void fun(int i);
int main()
{
int i=0;
i++;
for (i=0; i<=5; i++)
{
fun(i);
}
return 0;
}
void fun(int i)
{ if (i==3) return; cout << i; }
A. It prints: 012345
B. It prints: 0
C. It prints: 01245
D. It prints: 05
正解：C

質問 2：
What happens when you attempt to compile and run the following code?
#include <iostream>
#include <string>
using namespace std;
class SampleClass
{
string *s;
public:
SampleClass() { s = new string("Text");}
SampleClass(string s) { this->s = new string(s);}
~SampleClass() { delete s;}
void Print(){ cout<<*s;}
};
int main()
{
SampleClass *obj;
obj = new SampleClass("Test");
obj->Print();
}
A. It prints: TextTest
B. Garbage value.
C. It prints: Text
D. It prints: Test
正解：D

質問 3：
What happens when you attempt to compile and run the following code?
#include <iostream>
using namespace std;
int main()
{
int i=5;
switch(i)
{
case 1:
cout<<"Hello";
break;
case 2:
cout<<"world";
break;
case 3:
break;
default:
cout<<"End";
}
return 0;
}
A. It prints: world
B. It prints: Helloworld
C. It prints: Hello
D. It prints: End
正解：D

質問 4：
What happens when you attempt to compile and run the following code?
#include <iostream> using namespace std;
class A {
public :
void print() {
cout << "A ";
}
};
class B {
public :
void print() {
cout << "B ";
}
};
int main() {
B sc[2];
A *bc = (A*)sc;
for (int i=0; i<2;i++)
(bc++)->print();
return 0;
}
A. It prints: A A
B. It prints: B B
C. It prints: B A
D. It prints: A B
正解：A

質問 5：
What is the output of the program?
#include <iostream>
#include <string>
using namespace std;
int main()
{
char str[] = "Hello\0\World\0";
cout << str;
return 0;
}
A. It prints: World\0World
B. It prints: HW
C. It prints: Hello
D. It prints: World
正解：C

質問 6：
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 7：
What happens when you attempt to compile and run the following code?
#include <iostream>
#include <string>
using namespace std;
class A {
public:
A() { cout << "A no parameters";}
A(string s) { cout << "A string parameter";}
A(A &a) { cout << "A object A parameter";}
};
class B : public A {
public:
B() { cout << "B no parameters";}
B(string s) { cout << "B string parameter";}
};
int main () {
A a1;
A a2("Test");
B b1("Alan");
return 0;
}
A. It prints: B string parameter
B. It prints: B no parameter
C. It prints: A no parametersA string parameterA no parametersB string parameter
D. It prints: A no parametersB string parameter
正解：C

質問 8：
What is the output of the program given below?
#include <iostream>
using namespace std;
int main (int argc, const char * argv[])
{
int i=10;
{
int i=0;
cout<<i;
}
{
i=5;
cout << i;
}
cout<<i;
return 0;
}
A. None of these
B. 101010
C. 1010
D. 055
正解：D