CPA : C++ Certified Associate Programmer : Part 06

CPA : C++ Certified Associate Programmer : Part 06

1. What is the output of the program if character 3 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’;
   }
   }
   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: float exception. Exception Nr.

2. 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 {
   public:
   void set() {
   y = 4; z = 2;
   }
   void Print() {
   cout << y << z;
   }
   };

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

   • It prints: 42
   • It prints: 44
   • It prints: 22
   • It prints: 2

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

   #include <iostream>
   #include <string>

   using namespace std;

   int f(int i);

   int main()
   {
   int i=0;
   i++;
   for (i=0; i<=2; i++)
   {
   cout<<f(i);
   }
   return 0;
   }

   int f(int a)
   {
   return a+a;
   }

   • It prints: 202020
   • It prints: 012
   • It prints: 024
   • It prints: 0

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

   #include <iostream>
   using namespace std;

   int mul (int a, int b=2)
   {
   int r;
   r=a*b;
   return (r);
   }

   int main ()
   {
   cout << mul(1) << mul(2,4);
   return 0;
   }

   • It prints: 2
   • It prints: 28
   • It prints: 8
   • It prints: 6

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

   #include <iostream>
   #include <string>

   using namespace std;

   struct Person {
   string name;
   int age;
   };

   class First
   {
   Person *person;
   public:
   First() {person = new Person;
   person?>name = “John”;
   person?>age = 30;
   }
   void Print(){
   cout<<person?>name << ” “<< person?>age;
   }
   };

   int main()
   {
   First t;
   t.Print();
   }

   • It prints: 30
   • It prints: John
   • It prints: John 30
   • It prints: John 30John 30

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

   #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 () {
   namespace newname = myNamespace1;
   using namespace newname;
   cout << x << ” “;
   cout << y;
   return 0;
   }

   • It prints: 5 1.5
   • It prints: 3.14 1.5
   • It prints: 5 10
   • It prints: 5

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

   #include <iostream>

   using namespace std;

   int main()
   {
   int i=2;
   switch(i)
   {
   case 1:
   cout<<“Hello”;
   break;
   case 2:
   cout<<“world”;
   break;
   case 3:
   printf(“End”);
   break;
   }
   return 0;
   }

   • It prints: Hello
   • It prints: world
   • It prints: End
   • It prints: E

8. 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();
   }

   • It prints: Text
   • It prints: Test
   • It prints: TextTest
   • Garbage value.

9. What happens if characters ‘w’, ‘o’, ‘r’, ‘l’ and ‘d’ are entered as input?

   #include <iostream>
   #include <string>

   using namespace std;

   int main()
   {
   string s1 = “Hello”;
   string s2;
   getline( cin, s2 );
   cout << s1 + s2;
   return( 0 );
   }

   • It prints: Helloworld
   • It prints: Hello
   • It prints: world
   • Compilation error

10. 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();
    }

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

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

    #include <iostream>
    #include <sstream>
    #include <string>

    using namespace std;

    int main(void)
    {
    string s;
    s = “Test”;
    s.resize (s.size() ? 1);
    cout<<s<<” “<<s.size();

    return 0;
    }

    • It prints: Test 4
    • It prints: Test 3
    • Compilation error
    • It prints: Tes 3

12. 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:
    void Print(){ cout<< “B”;}
    };
    int main()
    {
    A *obj;
    A ob1;
    obj = &ob1;
    obj>Print();
    B ob2;
    obj = &ob2;
    obj>Print();
    }

    • It prints: AB
    • It prints: AA
    • It prints: BA
    • It prints: BB

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

    #include <iostream>
    #include <string>

    using namespace std;

    class First
    {
    string *s;
    public:
    First() { s = new string(“Text”);}
    ~First() { delete s;}
    void Print(){ cout<<*s;}
    };
    int main()
    {
    First FirstObject;
    FirstObject.Print();
    FirstObject.~First();
    }

    • It prints: Text
    • Compilation error
    • Runtime error.
    • None of these

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

    #include <iostream>

    using namespace std;

    #include <iostream>

    using namespace std;

    class First
    {
    public:
    void Print(){ cout<<“from First”;}
    };

    int main()
    {
    First t[2];
    for (int i=0; i<2; i++)
    t[i].Print();
    }

    • It prints: from First
    • It prints: from Firstfrom First
    • Compilation error
    • Runtime error.

15. 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”;}
    B(int s) { cout << “B int parameter”;}
    };

    int main () {
    A a2(“Test”);
    B b1(10);
    B b2(b1);
    return 0;
    }

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

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

    #include <iostream>
    using namespace std;

    class A {
    public:
    int x;
    A() { x=0;}
    };

    class B : public A {
    public:
    B() { x=1;}
    };

    class C : private B {
    public:
    C() { x=2;}
    };

    int main () {
    C c1;
    cout << c1.x;
    return 0;
    }

    • It prints: 210
    • It prints: 110
    • It prints: 010
    • Compilation error

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

    #include <iostream>

    using namespace std;

    int op(int x, int y);

    int main()
    {
    float *pf;
    float f=0.9;
    pf=&f;
    cout << op(1, *pf);
    return 0;
    }

    int op(int x, int y)
    {
    return x*y;
    }

    • It prints: 0
    • It prints: 0.5
    • It prints: 1
    • It prints: ?1

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

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

    class A {
    public:
    int x;
    };

    class B : public A {
    public:
    B() { x=1;}
    B(int x) {this?>x = x;}
    };

    int main () {
    B c1;
    B c2(10);
    cout << c1.x;
    cout << c2.x;
    return 0;

    }

    • It prints: 010
    • It prints: 110
    • It prints: 00
    • It prints: 1

19. 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 A {
    public:
    virtual void Print(){ cout<< “B”; }
    };
    class C:public B {
    public:
    void Print(){ cout<< “C”; }
    };
    int main()
    {
    A ob1;
    B ob2;
    C ob3;
    A *obj;
    obj = &ob1;
    obj>Print();
    obj = &ob2;
    obj>Print();
    obj = &ob3;
    obj>Print();
    }

    • It prints: BBB
    • It prints: AAA
    • It prints: ABC
    • It prints: ABB

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

    #include <iostream>
    using namespace std;
    int x=5;
    static int y=0;

    void myFunction(int a)
    {
    y=++a;
    }

    int main (int argc, const char * argv[])
    {
    int i=0;

    myFunction(i);
    cout<<y<<” “<<x;
    }

    • It prints: 0 5
    • It prints: 5 1
    • It prints: 1 5
    • It prints: 5 0