Which of the following are entry controlled loops?

(a) for

(b) while

(c) do..while

(d) switch

1. only a
2. a and b
3. a and c
4. c and d

Rewrite the following do while program segment using for:

x = 10; y = 20;
do
{
    x++;
    y++;
} while (x<=20);
System.out.println(x * y );

Give the output of the following program segment. How many times is the loop executed?

for(x=10; x>20;x++)

System.out.println(x);

System.out.println(x*2);

Define a class to accept a number and check whether it is a SUPERSPY number or not. A number is called SUPERSPY if the sum of the digits equals the number of the digits.

Example1:

Input: 1021
output: SUPERSPY number [SUM OF THE DIGITS = 1+0+2+1 = 4,
NUMBER OF DIGITS = 4 ]

Example2:

Input: 125
output: Not an SUPERSPY number [1+2+5 is not equal to 3]