Question

The following program is designed using a class to find GCD of two numbers with the following specifications.

class name : GCD
Data members : n1, n2
Member Methods:

1. GCD(......): A parameterised constructor to accept the values of nl and n2.
2. void Compute(): To find GCD of the numbers n1 and n2.
3. void display(): To display GCD of the numbers.

There are some places left blank marked with ?1?, ?2?, ?3? and ?4? to be filled with the value/expression. 

import java.util.*; 
class GCD 
{ 
int n1, n2, t = 0;  
GCD( ..... ?1?...., n) 
{ 
   n1 = m; 
   n2 = n; 
void Compute() 
{ 
while(.....?2?.....) 
   { 
   t = n1 % n2; 
   n1 = n2; 
   n2 = ?3?; 
   }
}
void Display() 
   { 
System.out.println("GCD of two numbers = " + ....?4?.....); 
   } 
}

Based on the above discussion, answer the following questions:

1. What value will be filled in place of ?1?
   1. 1
   2. 0
   3. m
   4. t
2. What logical expression will be filled in place of ?2?
   1. n1 %2 == 0
   2. n1/n2 == 0
   3. n1%n2 == 0
   4. n1%n2 != 0
3. What variable will be filled in place of ?3?
   1. n1
   2. t
   3. n2
   4. gcd
4. What variable will be filled in place of ?4?
   1. n2
   2. n1
   3. t
   4. None

Answer 1

1. iii. m
2. iv. n1%n2 != 0
3. ii. t
4. i. n2