Argument Passing C++ MCQ

1. How many ways of passing a parameter are there in c++?
a) 1
b) 2
c) 3
d) 4


2. Which is used to keep the call by reference value as intact?
a) static
b) const
c) absolute
d) none of the mentioned


3. By default how the value are passed in c++?
a) call by value
b) call by reference
c) call by pointer
d) none of the mentioned


4. What is the output of this program?

1.     #include <iostream>

2.     using namespace std;

3.     void copy (int& a, int& b, int& c)

4.     {

5.         a *= 2;

6.         b *= 2;

7.         c *= 2;

8.     }

9.     int main ()

10.     {

11.         int x = 1, y = 3, z = 7;

12.         copy (x, y, z);

13.         cout << "x =" << x << ", y =" << y << ", z =" << z;

14.         return 0;

15.     }

a) 2 5 10
b) 2 4 5
c) 2 6 14
d) none of the mentioned


5. What is the new value of x?

1.     #include <iostream>

2.     using namespace std;

3.     void fun(int &x)

4.     {

5.         x = 20;

6.     }

7.     int main()

8.     {

9.          int x = 10;

10.          fun(x);

11.          cout << "New value of x is " << x;

12.          return 0;

13.     }

a) 10
b) 20
c) 15
d) none of the mentioned


6. What is the output of this program?

1.     #include <iostream>

2.     using namespace std;

3.     long factorial (long a)

4.     {

5.         if (a > 1)

6.             return (a * factorial (a + 1));

7.         else

8.             return (1);

9.     }

10.     int main ()

11.     {

12.         long num = 3;

13.         cout << num << "! = " << factorial ( num );

14.         return 0;

15.     }

a) 6
b) 24
c) segmentation fault
d) compile time error


7. What is the output of this program?

1.     #include <iostream>

2.     using namespace std;

3.     void square (int *x)

4.     {

5. 	*x = (*x + 1) * (*x);

6.     }

7.     int main ( )

8.     {

9. 	int num = 10;

10.         square(&num);

11.         cout << num; 

12.         return 0;

13.     }

a) 100
b) compile time error
c) 144
d) 110


8. What is the output of this program?

1.     #include <iostream>

2.     using namespace std;

3.     int add(int a, int b);

4.     int main()

5.     {

6.         int i = 5, j = 6;

7.         cout << add(i, j) << endl;

8.         return 0;

9.     }

10.     int add(int a, int b )

11.     {

12.         int sum = a + b;

13.         a = 7;

14.         return a + b;

15.     }

a) 11
b) 12
c) 13
d) compile time error


9. What will happen when we use void in argument passing?
a) It will not return value to its caller
b) It will return value to its caller
c) both a & b are correct
d) none of the mentioned

10. What is the output of this program?

1.     #include <iostream>

2.     using namespace std;

3.     void Sum(int a, int b, int & c)

4.     {

5.         a = b + c;

6.         b = a + c;

7.         c = a + b;

8.     }

9.     int main()

10.     {

11.         int x = 2, y =3;

12.         Sum(x, y, y);

13.         cout << x << " " << y;

14.         return 0; 

15.     }

a) 2 3
b) 6 9
c) 2 15
d) compile time error