NIELIT 2022 April Scientist B | Section B | Question: 76

Question

What is printed by the print statements in the program $\text{P1}$ assuming call by reference parameter passing ?

Program P1()
{
    x = 10;
    y = 3; 
    func1(y, x, x);
    print x;
    print y;
}
func1(x, y, z)
{
    y = y+4;
    z = x+ y+ z;
}

• A. $10, 3$
• B. $31, 3$
• C. $27, 7$
• D. $33, 5$

Comments

1. Program P1()
2. {
3. x = 10;
4. y = 3;
5. func1(y, x, x);
6. print x; here x got modified due to call by reference in func1. It got updated as 31.
7. print y; // it is not modified in func1 so y = 3;
8. }
9. func1(x=3, y=10, z=10)
10. {
11. y = y+4; // y = 14; Note: y & z both point to x only due to call by reference.
12. z = x+ y+ z; // z = x(3) + y(14) + z(14); => z = 31
13. }

O/P: 31, 3

Answer 1

Correct option is B. 31, 3

Answer 2

https://gateoverflow.in/735/gate-cse-2001-question-2-17-ugcnet-aug2016-iii-21