CPA : C++ Certified Associate Programmer : Part 07

CPA : C++ Certified Associate Programmer : Part 07

1. What happens when you attempt to compile and run the following code?

   #include <iostream>
   #include <string>

   using namespace std;

   class A {
   public:
   string s;
   A(string s) { this>s = s; }
   };

   class B {
   public:
   string s;
   B (A a) { this>s = a.s; }
   void print() { cout<<s; }
   };

   int main()
   {
   A a(“Hello world”);
   B b=a;
   b.print();
   }

   • It prints: Hello world
   • It prints: Hello
   • Compilation error
   • None of these

2. 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 a2(“Test”);
   B b1(“Alan”);
   B b2(b1);
   return 0;
   }

   • It prints: A no parametersA no parametersB string parameter
   • It prints: A string parameterA no parametersB string parameterA object A parameter
   • It prints: A no parametersB string parameter
   • It prints: A no parametersA no parameters

3. What happens when you attempt to compile and run the following code?

   #include <iostream>

   using namespace std;

   void fun(char*);

   int main()
   {
   char t[4]={‘0’, ‘1’, ‘2’, ‘3’};
   fun(&t[2]);
   return 0;
   }
   void fun(char *a)
   {
   cout << *a;
   }

   • It prints: 2
   • It prints: 21
   • It prints: 00
   • It prints: 02

4. 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;
   }
   cout<<i;
   return 0;
   }

   • 1010
   • 100
   • 010
   • None of these

5. What is the output of the program?

   #include <iostream>
   #include <string>

   using namespace std;

   int main()
   {
   string s1[]= {“Hello” , “World” };

   for (int i=0; i<2; i++) {
   cout << s1[i];
   }
   return( 0 );
   }

   • It prints: HelloWorld
   • It prints: Hello
   • It prints: WorldHello
   • It prints: World

6. Which code, inserted at line 14, generates the output “3.14 10”?

   #include <iostream>
   using namespace std;
   namespace myNamespace1
   {
   int x = 5;
   int y = 10;
   }
   namespace myNamespace2
   {
   float x = 3.14;
   float y = 1.5;
   }
   int main () {
   //insert code here
   cout << x << ” ” << y;
   return 0;
   }

   • using myNamespace2::y; using myNamespace1::x;
   • using namespace myNamespace1;
   • using namespace myNamespace1; using namespace myNamespace2;
   • using myNamespace1::y; using myNamespace2::x;

7. What is the output of the program if character 4 is supplied as input?

   #include <iostream>
   using namespace std;
   int main () {
   int c;
   cin >> c;
   try
   {
   switch (c)
   {
   case 1:
   throw 20;
   case 2:
   throw 5.2f;
   case 3:
   throw ‘a’;
   default:
   cout<<“No exception”;
   }
   }
   catch (int e)
   { cout << “int exception. Exception Nr. ” << e; }
   catch (float e)
   { cout << “float exception. Exception Nr. ” << e; }
   catch (…)
   { cout << “An exception occurred.”; }
   return 0;
   }

   • It prints: float exception. Exception Nr.
   • It prints: int exception. Exception Nr.
   • It prints: An exception occurred
   • It prints: No exception

8. What happens when you attempt to compile and run the following code?

   #include <iostream>

   using namespace std;

   int main(int argc, char *argv[]) {
   char *s = “ABCDEF”;
   cout << s+2;
   return 0;
   }

   • It prints: CDEF
   • It prints: ABCDEF
   • It prints: BCDEF
   • None of these

9. What happens when you attempt to compile and run the following code?

   #include <iostream>

   using namespace std;

   class First
   {
   public:
   void Print(){ cout<<“from First”;}
   };
   class Second
   {
   public:
   void Print(){ cout<< “from Second”;}
   };
   int main()
   {
   First FirstObject;
   FirstObject.Print();
   Second SecondObject;
   SecondObject.Print();
   }

   • It prints: from First
   • It prints: from Firstfrom First
   • It prints: from Firstfrom Second
   • It prints: from Secondfrom Second

10. Which code, inserted at line 8, generates the output “0102020”?

    #include <iostream>
    using namespace std;
    class Base {
    static int age;
    public:
    Base () {};
    ~Base () {};
    //insert code here
    void Print() { cout << age;}
    };

    int Base::age=0;

    int main () {
    Base a,*b;
    b = new Base();
    a.Print();
    a.setAge(10);
    a.Print();
    b?>setAge();
    a.Print();
    b?>Print();
    return 0;
    }

    • void setAge(int a) {age = a;}
    • void setAge() {age = 20;}
    • void setAge() {age = 10;}
    • void setAge(int a=20) {age = a;}

11. What is the output of the program if character 2 is supplied as input?

    #include <iostream>

    using namespace std;

    int main () {
    int c;
    cin >> c;
    try
    {
    switch (c)
    {
    case 1:
    throw 20;
    case 2:
    throw 5.2f;
    }
    }
    catch (int e)
    { cout << “int exception. Exception Nr. ” << e; }
    catch (float e)
    { cout << “float exception. Exception Nr. ” << e; }
    catch (…)
    { cout << “An exception occurred.”; }
    return 0;
    }

    • It prints: float exception. Exception Nr.
    • It prints: int exception. Exception Nr. 20
    • It prints: An exception occurred
    • It prints: float exception. Exception Nr. 5.2

12. What happens when you attempt to compile and run the following code?

    #include <iostream>
    #include <string>
    using namespace std;

    class B;

    class A {
    int age;
    public:
    A () { age=5; };
    friend class B;
    };

    class B {
    string name;
    public:
    B () { name=”Bob”; };
    void Print(A ob) {
    cout << name << ob.age;
    }
    };

    int main () {
    A a;
    B b;
    b.Print(a);
    return 0;
    }

    • It prints: Bob5
    • It prints: Bob
    • It prints: 5
    • None of these

13. What happens when you attempt to compile and run the following code?

    #include <iostream>

    using namespace std;

    int main (int argc, const char * argv[])
    {
    int a = 30, b = 1, c = 5, i=10;
    i = b < a < c;
    cout << i;
    return 0;
    }

    • compilation fails
    • It prints: 10
    • It prints: 0
    • It prints: 1

14. 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;

    }

    • It prints: 5
    • It prints: 1?5
    • It prints: 05
    • It prints: 0

15. 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;
    }

    • It prints: 0
    • It prints: 10
    • It prints: 100
    • It prints: -1

16. 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;
    }

    • It prints: 2
    • It prints: 0
    • It prints: 4
    • It prints: 16

17. What happens when you attempt to compile and run the following code?

    #include <iostream>
    using namespace std;

    int main(){
    int i = 1;
    if (–i==1) {
    cout << i;
    } else {
    cout << i-1;
    }
    return 0;
    }

    • It prints: 0
    • It prints: 1
    • It prints: -1
    • It prints: 2

18. Which code, inserted at line 10, generates the output “Hello World”?

    #include <iostream>
    #include <string>
    using namespace std;
    string fun(string, string);
    int main()
    {
    string s=”Hello”;
    string *ps;
    ps = &s;
    //insert code here
    return 0;
    }

    string fun(string s1, string s2)
    {
    return s1+s2;
    }

    • cout << fun(” World”);
    • cout << fun(*ps);
    • cout << fun(“Hello”);
    • cout << fun(“Hello”, ” World”);

19. What happens when you attempt to compile and run the following code?

    #include <iostream>
    using namespace std;

    int main(){
    int i = 1;
    if (i==1) {
    cout << i;
    } else {
    cout << i-1;
    }
    return 0;
    }

    • It prints: 0
    • It prints: 1
    • It prints: -1
    • It prints: 2

20. What happens when you attempt to compile and run the following code?

    #include <iostream>

    using namespace std;

    int main()
    {
    float x=3.5,y=1.6;
    int i,j=2;
    i = x + j + y;
    cout << i;
    return 0;
    }

    • It prints: 7
    • It prints: 6
    • It prints: 7,1
    • Compilation error