CPA : C++ Certified Associate Programmer : Part 10

CPA : C++ Certified Associate Programmer : Part 10

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

   #include <iostream>
   using namespace std;

   int main() {
   float i = 1.0 / 2 * 2 / 1 * 2 / 4 * 4 / 2;
   cout << i;
   return 0;
   }

   • It prints: 0
   • It prints: 1
   • It prints: 2
   • It prints: 0.5

2. 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 () {
   {
   using namespace myNamespace1;
   cout << x << ” “;
   }{
   using namespace myNamespace2;
   cout << y;
   }
   return 0;
   }

   • It prints: 5 1.5
   • It prints: 3.14 10
   • Compilation error
   • None of these

3. 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;
   }
   {
   int i=5;
   cout << i;
   }
   cout<<i;
   return 0;
   }

   • 1010
   • 101010
   • 0510
   • None of these

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

   #include <iostream>
   using namespace std;
   int main()
   {
   const int x=20;
   const int *ptr;
   ptr = &x;
   *ptr = 10;
   cout<<*ptr;
   return 0;
   }

   • It prints: 20
   • It prints: 10
   • Compilation error at line 8
   • It prints address of ptr

5. What will the variable “age” 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;
   }
   };

   • public
   • private
   • protected
   • None of these

6. 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;}
   };
   class B {
   public:
   int x;
   B() { x=1;}
   };
   class C :public A, public B {
   public:
   int x;
   C(int x) {
   this?>x = x;
   A::x = x + 1;
   }
   void Print() { cout << x << A::x << B::x; }
   };
   int main () {
   C c2(1);
   c2.Print();
   return 0;
   }

   • It prints: 1
   • It prints: 121
   • It prints: 111
   • It prints: 2

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

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

   class myClass : public exception
   {
   virtual const char* what() const throw()
   {
   return “My exception.”;
   }
   } obj;

   int main () {
   try
   {
   throw obj;
   }
   catch (exception& e)
   {
   cout << e.what() << endl;
   }
   return 0;
   }

   • It prints: My exception.
   • It prints: 0
   • It prints: 1
   • Compilation error

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

   #include <iostream>

   using namespace std;

   #define DEF_A 0

   int main(int argc, char *argv[]) {
   cout << DEF_A;
   return 0;
   }

   • It prints: 1
   • It prints: 0
   • It prints: ?1
   • Compilation error

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

   #include <iostream>

   using namespace std;

   int main()
   {
   int x=2, *y, z=3;
   y = &z;
   cout<<x**y*x***y;
   return 0;
   }

   • It prints: 36
   • It prints: 14
   • It prints: 16
   • Compilation error

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

    #include <iostream>
    using namespace std;

    int main(){
    int i = 1;
    for(i=10; i>-1; i/=2) {
    if(!i)
    break;
    }
    cout << i;
    return 0;
    }

    • It prints: 0
    • It prints: 1
    • It prints: -1
    • Compilation error

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

    #include <iostream>

    using namespace std;

    int main()
    {
    const int x=0;
    const int *ptr;
    ptr = &x;
    cout<<*ptr;
    return 0;
    }

    • It prints: 0
    • It prints address of x
    • It prints: 1
    • Compilation error

12. 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”;}
    };
    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 will happen when you attempt to compile and run the following code?

    #include <iostream>

    using namespace std;

    int main()
    {
    const char *s;
    char str[] = “Hello “;
    s = str;
    while(*s) {
    cout << *++s;
    *s++;
    }

    return 0;
    }

    • It will print:”el “
    • The code will not compile.
    • It will print:”Hello “
    • It will print garbage value

14. How could you pass arguments to functions?

    • by value
    • by reference
    • by pointer
    • by void

15. Which of the following is a logical operator?

    • &
    • &&
    • ||
    • !

16. Which of the following statements are correct about an array?

    int tab[10];

    • The array can store 10 elements.
    • The expression tab[1] designates the very first element in the array.
    • The expression tab[9] designates the last element in the array.
    • It is necessary to initialize the array at the time of declaration.

17. Which code, inserted at line 5, generates the output “ABC”?

    #include <iostream>
    using namespace std;
    class A {
    public:
    //insert code here
    };
    class B:public A {
    public:
    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();
    }

    • void Print(){ cout<<“A”;}
    • virtual void Print(){ cout<<“A”;}
    • virtual void Print(string s){ cout<<s;}
    • None of these

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

    #include <iostream>
    #include <cstdarg>

    using namespace std;

    int mult(int f, int s, int t);

    int main()
    {
    cout << mult(1,2,3);
    return 0;
    }

    int mult(int f, int s, int t)
    {
    int mult_res;
    mult_res = f*s*t;
    return mult_res;
    }

    • It prints: 0
    • It prints: 6
    • It prints: 2
    • It prints: 3

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

    #include <iostream>
    using namespace std;

    int main(){
    int i, j;
    for(i = 0, j = 1; j < 2, i < 4; i++, j++);
    cout << i << ” ” << j;
    return 0;
    }

    • It prints: 4 5
    • It prints: 2 3
    • It prints: 3 2
    • It prints: 4 3

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

    #include <iostream>
    using namespace std;

    int main(){
    int *i;
    i = new int;
    *i = 1.0 / 2 * 2 / 1 * 2 / 4 * 4;
    cout << *i;
    return 0;
    }

    • It prints: 0
    • It prints: 1
    • It prints: 2
    • It prints: 0.5