CPA : C++ Certified Associate Programmer : Part 03

CPA : C++ Certified Associate Programmer : Part 03

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

   #include <iostream>

   using namespace std;

   int main()
   {
   int i = 0;
   do {
   i++;
   if (i==3)
   break;
   cout<<i;
   }
   while(i < 5);
   return 0;
   }

   • It prints: 12
   • It prints: 1
   • It prints: 0
   • No output

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

   #include <iostream>
   using namespace std;
   class complex{
   double re;
   double im;
   public:
   complex() : re(0),im(0) {}
   complex(double x) { re=x,im=x;};
   complex(double x,double y) { re=x,im=y;}
   void print() { cout << re << ” ” << im;}
   };

   int main(){
   complex c1;
   c1.print();
   return 0;
   }

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

3. What is not inherited from the base class?

   • constructor
   • destructor
   • operator=()
   • operator+()

4. 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;
   }

   • It will print: Hello World
   • It will print: Hello
   • It will print: World
   • It will print: HW

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

   #include <iostream>

   using namespace std;

   int main()
   {
   int i = 5;
   do {
   i??;
   cout<<i;
   }
   while(i >= 0);
   return 0;
   }

   • It prints: 43210?1
   • It prints: ?1
   • It prints: 4321
   • It prints: 1

6. What is the output of the program?

   #include <iostream>
   #include <string>

   using namespace std;

   class First
   {
   string name;
   public:
   First() {
   name = “Alan”;
   }
   void setName(string n) {this?>name = n;}
   void setName() {this?>name = “John”;}
   void Print(){
   cout << name;
   }
   };

   int main()
   {
   First ob1,*ob2;
   ob2 = new First();
   First *t;
   t = &ob1;
   t?>setName();
   t?>Print();
   t = ob2;
   t?>setName(“Steve”);
   ob2?>Print();
   }

   • It prints: JohnSteve
   • It prints: AlanAlan
   • It prints: AlanSteve
   • It prints: JohnAlan

7. What is the output of the program?

   #include <iostream>
   #include <string>

   using namespace std;

   union t
   {
   char c;
   int i;
   };

   class First
   {
   union t u;
   public:
   First() {
   u.c = ‘A’;
   }
   void Print(){
   cout << u.c;
   }
   };

   int main()
   {
   First *t = new First();
   t?>Print();
   }

   • Garbage value
   • It prints: A
   • It prints: A 65
   • Compilation error

8. How many times will the program print “HELLO” ?

   #include <iostream>

   using namespace std;

   int main()
   {
   cout<<“HELLO”;
   main();
   return 0;
   }

   • 65536
   • 32769
   • 1
   • Till stack overflows

9. 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;
   }

   • It prints: 05
   • It prints: 012345
   • It prints: 01245
   • It prints: 0

10. If there is one, point out an error in the program

    #include <iostream>

    using namespace std;

    int main()
    {
    int c = ‘a’;
    switch(i)
    {
    case ‘2’:
    cout<<“OK”;
    case ‘1’:
    cout<<“Error”;
    default:
    break;
    }
    return 0;
    }

    • No Error
    • Use of undeclared identifier ‘i’
    • Illegal use of ‘continue’
    • Illegal use of ‘break’

11. 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;
    }

    • It prints: Hello
    • It prints: World
    • It prints: HW
    • It prints: World\0World

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

    #include <iostream>

    using namespace std;

    int main()
    {
    int i = 0;
    i++;
    goto lab;
    i++;
    lab:
    cout<<i;
    return 0;
    }

    • It prints: 0
    • It prints: 34
    • It prints: 1
    • It prints: 3

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

    #include <iostream>

    using namespace std;

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

    • It prints: Constructorfrom First
    • It prints: Constructor
    • It prints: from First
    • None of these

14. Which code, inserted at line 10, generate the output “50”?

    #include <iostream>
    using namespace std;

    class Base {
    int age;
    public:
    Base () {
    age=5;
    };
    //insert code here
    void Print() { cout << age;}
    };

    void setAge(Base &ob) {ob.age = 0;}

    int main () {
    Base a;
    a.Print();
    setAge(a);
    a.Print();
    return 0;
    }

    • friend void setAge(Base ob);
    • friend void setAge(Base *ob);
    • friend void setAge(Base &ob);
    • None of these

15. 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;
    }

    • It prints: 4John
    • It prints: 2John
    • It prints: 23
    • It prints: 43

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

    #include <iostream>
    using namespace std;

    int fun(int x) {
    return 2*x;
    }

    int main(){
    int i;
    i = fun(1) || fun(2);
    cout << i;
    return 0;
    }

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

17. Which code, inserted at line 8, generates the output “100”?

    #include <iostream>
    using namespace std;
    int fun(int);
    int main()
    {
    int *x = new int;
    *x=10;
    //insert code here
    return 0;
    }

    int fun(int i)
    {
    return i*i;
    }

    • cout << fun(*x) ;
    • cout << fun(10);
    • cout << fun(5) ;
    • cout << fun(y) ;

18. Which definitions are correct?

    • int age;
    • int double;
    • char c;
    • int char;

19. Which of the following is a user defined data type?

    1:

    struct person

    {

    char name[20];

    int age;

    };

    2:

    int l=2;

    3:

    enum color {red,blue, green};

    D.

    char c;

    • 1
    • 2
    • 3
    • 4

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

    #include <iostream>

    using namespace std;

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

    • It prints: Constructorfrom First
    • It prints: Constructorfrom FirstDestructor
    • It prints: Constructorfrom FirstDestructorDestructor
    • Compilation error at line 16