Predict the output of following C++ program. C #include<iostream> using namespace std; int &fun() { static int x = 10; return x; } int main() { fun() = 30; cout << fun(); return 0; }

Compiler Error: Function cannot be used as lvalue

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Question 1

Which of the following functions must use reference.

Assignment operator function
Copy Constructor
Destructor
Parameterized constructor

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Question 2

What is the return value of f(p, p) if the value of p is initialized to 5 before the call? Note that the first parameter is passed by reference, whereas the second parameter is passed by value.

  int f(int &x, int c) {     c  = c - 1;     if (c == 0) return 1;     x = x + 1;     return f(x, c) * x;  }

3024
6561
55440
161051

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Question 3

Which of the following is FALSE about references in C++

References cannot be NULL
A reference must be initialized when declared
Once a reference is created, it cannot be later made to reference another object; it cannot be reset.
References cannot refer to constant value

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Question 4

Predict the output of following C++ program.

#include<iostream> using namespace std;  int &fun() {     static int x = 10;     return x; } int main() {     fun() = 30;     cout << fun();     return 0; }

Compiler Error: Function cannot be used as lvalue
10
30

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Question 5

CPP

#include<iostream> using namespace std;  int &fun() {     int x = 10;     return x; } int main() {     fun() = 30;     cout << fun();     return 0; }

May cause runtime error
May cause compiler error
Always works fine.
0

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Question 6

Output of following C++ program?

CPP

#include<iostream> using namespace std;  int main() {   int x = 10;   int& ref = x;   ref = 20;   cout << "x = " << x << endl ;   x = 30;   cout << "ref = " << ref << endl;   return 0; }

```
x = 20  ref = 30 
```
```
x = 20  ref = 20 
```
```
x = 10  ref = 30 
```
```
x = 30  ref = 30 
```

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