CPA : C++ Certified Associate Programmer : Part 09

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

    #include <iostream>
    using namespace std;

    class A {
    public:
    virtual void Print()=0;
    };
    class B:public A {
    public:
    virtual void Print() { cout<< “B”; }
    };
    class C:public A {
    public:
    virtual void Print() { cout<< “C”; }
    };
    int main()
    {
    B ob2;
    C ob3;
    A *obj;
    obj = &ob2;
    obj>Print();
    obj = &ob3;
    obj>Print();
    }

    • It prints: BC
    • It prints: CB
    • It prints: CC
    • It prints: BB
  2. 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(0);
    cout << i;
    return 0;
    }

    • It prints: 0
    • It prints: 1
    • It prints: -1
    • Compilation error
  3. What is the output of the program?

    #include <iostream>
    #include <string>

    using namespace std;

    int main()
    {
    string s1=”Wo”;
    string s2;
    s2 = s1;
    string s3;
    s3 = s2.append(“rldHello”);
    cout << s3;
    return( 0 );
    }

    • It prints: WorldHello
    • It prints: HelloWo
    • It prints: World
    • It prints: Hello
  4. Which of the structures is incorrect?

    1:
    struct s1{
    int x;
    long int li;
    };

    2:
    struct s2{
    float f;
    struct s2 *s;
    };

    3:
    struct s3{
    float f;
    struct s3 s;
    };

    • 1
    • 2
    • 3
    • 2,3
  5. What happens when you attempt to compile and run the following code?

    #include <iostream>

    using namespace std;

    int x=5;
    static int y;
    int i=0;

    void static myFunction()
    {
    y=x++ + ++i;
    }

    int main (int argc, const char * argv[])
    {
    x++;
    myFunction();
    cout<<y<<” “<<x<< ” ” << i;
    }

    • Compilation fails
    • It prints: 5 5 0
    • It prints: 7 7 1
    • It prints: 6 5 1
  6. What happens when you attempt to compile and run the following code?

    #include <iostream>

    using namespace std;

    int main()
    {
    int x=0;
    int *ptr;

    ptr = &x;
    cout<<x<<” “<<*ptr;

    return 0;
    }

    • It prints: 0 0
    • It prints address of ptr
    • It prints: 1
    • It prints: 2
  7. What happens when you attempt to compile and run the following code?

    #include <iostream>

    using namespace std;

    int main()
    {
    int x=20;
    int *ptr;
    ptr = &x;
    cout<<*ptr;
    return 0;
    }

    • It prints: 20
    • It prints: 0
    • It prints address of ptr
    • It prints: 2
  8. Point out an error in the program.

    #include <iostream>
    using namespace std;
    int main()
    {
    char s1[] = “Hello”;
    char s2[] = “world”;
    char *const ptr = s1;
    *ptr = ‘a’;
    ptr = s2;
    return 0;
    }

    • No error
    • Cannot modify a const object
    • Compilation error at line 9
    • None of these
  9. What is the output of the program?

    #include <iostream>
    #include <string>

    using namespace std;

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

    • It prints: Hello
    • It prints: HelloWorld
    • It prints: WorldHello
    • It prints: WorldHelloWorld
  10. What happens when you attempt to compile and run the following code?

    #include <iostream>

    using namespace std;

    struct {
    int x;
    char c;
    union {
    float f;
    int i;
    };
    } s;

    int main (int argc, const char * argv[])
    {
    s.x=10;
    s.i=0;
    cout << s.i << ” ” << s.x;
    }

    • It prints: 0 10
    • It prints: 11
    • Compilation error
    • None of these
  11. Given:

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

    int main () {
    try
    {
    int * myarray= new int[1000];
    }
    catch (bad_alloc&)
    {
    cout << “Error allocating memory”;
    }
    catch (exception& e)
    {
    cout << “Standard exception”;
    }
    catch (…)
    {
    cout << “Unknown exception”;
    }
    return 0;
    }

    What will happen if we use the operator “new” and the memory cannot be allocated?

    • It prints: Error allocating memory
    • It prints: Standard exception
    • It prints: Unknown exception
    • Compilation error
  12. What happens if character 3 is entered as input?

    #include <iostream>
    using namespace std;
    class A {
    public:
    int i;
    };
    int main () {
    int c;
    A obj;
    obj.i = 5;
    cin >> c;
    try
    {
    switch (c)
    {
    case A. throw 20;
    case B. throw 5.2f;
    case C. throw obj;
    default: cout<<“No exception”;
    }
    }
    catch (int e)
    { cout << “int exception. Exception Nr. ” << e; }
    catch (A e)
    { cout << “object exception. Exception Nr. ” << e.i; }
    catch (…)
    { cout << “An exception occurred.”; }
    return 0;
    }

    • It prints: object exception. Exception Nr. 5
    • It prints: int exception. Exception Nr.
    • It prints: An exception occurred
    • It prints: No exception
  13. What happens when you attempt to compile and run the following code?

    #include <iostream>

    using namespace std;

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

    int op(int x, float y)
    {
    return x+y;
    }

    int main()
    {
    int i=1, j=2, k, l;
    float f=0.23;
    k = op(i, j);
    l = op(j, f);
    cout<< k << “,” << l;
    return 0;
    }

    • It prints: 1,1
    • It prints: 1,3
    • It prints: 1,2
    • Compilation fails
  14. What happens when you attempt to compile and run the following code?

    #include <iostream>

    using namespace std;

    int main()
    {
    int x,y=10;
    float f;
    f = 5.20;
    x=(int) f;
    cout << x <<“, “;
    f=float (y);
    cout << f;
    return 0;
    }

    • It prints: 5, 10
    • It prints: 5.2, 10
    • It prints: 5.20, 10.0
    • It prints: 5.2, 10.00
  15. 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;
    }

    • It prints: A A
    • It prints: B B
    • It prints: A B
    • It prints: B A
  16. What is the output of the program if characters ‘t’, ‘e’, ‘s’ and ‘t’ enter are supplied as input?

    #include <iostream>
    #include <string>

    using namespace std;

    int main()
    {
    string s;
    getline( cin, s );
    cout << s << ” ” << s.length();
    return( 0 );
    }

    • It prints: test 4
    • It prints: test
    • It prints: test 5
    • It prints: 4
  17. Which code, inserted at line 15, generates the output “5 Bob”?

    #include <iostream>
    #include <string>
    using namespace std;
    class B;
    class A {
    int age;
    public:
    A () { age=5; };
    friend void Print(A &ob, B &so);
    };
    class B {
    string name;
    public:
    B () { name=”Bob”; };
    //insert code here
    };

    void Print(A &ob, B &so) {
    cout<<ob.age << ” ” << so.name;
    }

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

    • friend void Print(A ob, B so);
    • friend void Print(A &ob, B &so);
    • friend void Print(A *ob, B *so);
    • None of these
  18. Which of the following statements are correct?

    • A function can be defined inside another function
    • A function may have any number of return statements each returning different values.
    • A function can return floating point value
    • In a function two return statements should never occur.
  19. What happens when you attempt to compile and run the following code?

    #include <iostream>

    using namespace std;

    int main()
    {
    int *t;

    t = new int[2];
    for (int i=0; i<2; i++) {
    t[i]=0;
    }

    cout << t[1];
    }

    • It prints: 0
    • It prints: 1
    • It prints: 2
    • It prints: 3
  20. What is the output of the program?

    #include <iostream>
    #include <string>

    using namespace std;

    class First
    {
    string name;
    public:
    First() {
    name = “Alan”;
    }
    void Print(){
    cout << name;
    }
    };

    int main()
    {
    First ob1,*ob2;
    ob2 = new First();
    ob1.Print();
    ob2?>Print();
    }

    • Garbage value
    • It prints: AlanAlan
    • It prints: Alan
    • It prints: Al
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