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Java Functions

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Question 1

The function f is defined as follows:

C++

int f(int n) {
    if (n <= 1) return 1;
    else if (n % 2 == 0) return f(n / 2);
    else return f(3 * n - 1);
}

int f (int n) {
    if (n <= 1) return 1;
    else if (n % 2  ==  0) return f(n/2);
    else return f(3n - 1);
}

Java

int f(int n) {
    if (n <= 1) return 1;
    else if (n % 2 == 0) return f(n / 2);
    else return f(3 * n - 1);
}

Python

def f(n):
    if n <= 1:
        return 1
    elif n % 2 == 0:
        return f(n // 2)
    else:
        return f(3 * n - 1)

JavaScript

function f(n) {
    if (n <= 1) return 1;
    else if (n % 2 === 0) return f(n / 2);
    else return f(3 * n - 1);
}

Assuming that arbitrarily large integers can be passed as a parameter to the function, consider the following statements.
1. The function f terminates for finitely many different values of n ≥ 1.
ii. The function f terminates for infinitely many different values of n ≥ 1.
iii. The function f does not terminate for finitely many different values of n ≥ 1.
iv. The function f does not terminate for infinitely many different values of n ≥ 1.
Which one of the following options is true of the above?

(i) and (iii)
(i) and (iv)
(ii) and (iii)
(ii) and (iv)

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Question 2

Predict the output of the following program.

Java

class Test
{
    public static void main(String[] args)
    {
        String str = "geeks";
        str.toUpperCase();
        str += "forgeeks";
        String string = str.substring(2,13);
        string = string + str.charAt(4);;
        System.out.println(string);
    }
}

eksforgeekss
eksforgeeks
EKSforgeekss
EKSforgeeks

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Question 3

Java

class Test {
public static void swap(Integer i, Integer j) {
      Integer temp = new Integer(i);
      i = j;
      j = temp;
   }
   public static void main(String[] args) {
      Integer i = new Integer(10);
      Integer j = new Integer(20);
      swap(i, j);
      System.out.println("i = " + i + ", j = " + j);
   }
}

i = 10, j = 20
i = 20, j = 10
i = 10, j = 10
i = 20, j = 20

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Question 4

Predict the output of the following program.

Java

class Test
{
    public void demo(String str)
    {
        String[] arr = str.split(";");
        for (String s : arr)
        {
            System.out.println(s);
        }
    }

    public static void main(String[] args)
    {
        char array[] = {'a', 'b', ' ', 'c', 'd', ';', 'e', 'f', ' ', 
                        'g', 'h', ';', 'i', 'j', ' ', 'k', 'l'};
        String str = new String(array);
        Test obj = new Test();
        obj.demo(str);
    }
}

```
ab cd
ef gh
ij kl
```
```
ab
cd;ef
gh;ij
kl
```
Compilation error

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Question 5

What is the result of the following program?

program side-effect (input, output);
    var x, result: integer;
    function f (var x:integer):integer;
    begin
        x:x+1;f:=x;
    end;
begin
    x:=5;
    result:=f(x)*f(x);
    writeln(result);
end;

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Question 6

Consider the following Java code fragment:

1   public class While
2   {
3    public void loop()
4      {
5      int x = 0;
6       while(1)
7         {
8         System.out.println("x plus one is" +(x+1));
9        }
10     }
11  }

There is syntax error in line no. 1
There is syntax errors in line nos. 1 & 6
There is syntax error in line no. 8
There is syntax error in line no. 6

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Question 7

Study the following program:

// precondition: x>=0
public void demo(int x)
{
    System.out.print(x % 10);
    if (x % 10 != 0) {
        demo(x / 10);
    }
    System.out.print(x % 10);
}

Which of the following is printed as a result of the call demo(1234)?

1441
3443
12344321
4321001234

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Question 8

Consider the following JAVA program :

public class First {
                 public static int CBSE (int x) {
                 if (x < 100) x = CBSE (x + 10);
                     return (x – 1);
                        }
      public static void main (String[] args){
      System.out.print(First.CBSE(60));
                         }
                           }

What does this program print ?

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Question 9

Given the array of integers ‘array’ shown below : 13, 7, 27, 2, 18, 33, 9, 11, 22, 8. What is the output of the following JAVA statements ?

int [ ] p = new int [10];
int [ ] q = new int [10];
for (int k = 0; k < 10; k ++)
p[k] = array [k];
q = p;
p[4] = 20;
System.out.println(array [4] + “ : ” + q[4]);

20 : 20
18 : 18
18 : 20
20 : 18

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Question 10

Output of following Java program?

class Main {
    public static void main(String args[]) {   
             System.out.println(fun());
    } 
 
    int fun()
    {
      return 20;
    }
}

20
compiler error
0
garbage value

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