Question

The following program segment calculates the norm of a number. Thenorm of a number is the square root of sum of squares of all the digits of the number. 

Sample Input: 68
Sample Output: The norm of 68 is 10
[Hint: 6x6 + 8x8 = 36 + 64 = 100
The square root of 100 is 10. Hence, norm of 68 is 10] 

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

Scanner in = new Scanner(System.in);
int num;
int d, s = 0; 
num = ..... ?1? .....
while (....?2?....)
{
d = n % 10; 
s = ....?3?....; 
n = n / 10;
}
System.out.println("The norm of" + num + "is" + ...?4?...);

Based on the above discussion, answer the following questions:

1. Which of the following will be filled in place of ?1?
   1. in.nextlnteger;
   2. in.Nextlnt();
   3. in.nextlnt()
   4. in.nextint();
2. What will you fill in place of ?2?
   1. num > 0
   2. num < 0
   3. num > 1
   4. num = 0
3. What will you fill in place of ?3?
   1. s + d * d
   2. s * d + d
   3. s * s + d
   4. s + d
4. What will you fill in place of ?4?
   1. Math.sqrt(s)
   2. Math.SQRT(s)
   3. Math.sqrt(n)
   4. Math.sqrt(num)

Answer 1

1. iii. in.nextlnt();
2. i. num > 0
3. i. s + d * d
4. i. Math.sqrt(s)