Page 574 - ComputerScience_Class_11

22 else

23 continue;
24 }

25 System.out.println("the sum of odd numbers in the even positions is "+s);
26 } //end of main
27 } //end of class

The output of the preceding program is as follows:

BlueJ: Terminal Window - Java
Options

enter the size of the array
5
enter the array elements
22
77
44
55
11
the sum of odd numbers in the even positions is 11

Program 7 A perfect number is a positive integer that is equal to the sum of its proper divisors. The
smallest perfect number is 6, which is the sum of 1, 2 and 3. Other perfect numbers are 28,
496 and 8,128.
Class name : Perfect

Data members/Instance variables
num : to store the number
Methods/Member functions
Perfect(int n) : parameterised constructor to initialise the data
member num = n
int sumOfFactors(int i) : returns the sum of the factors of the number (num),
excluding itself, using the recursive technique
void check() : checks whether the given number is perfect by invoking
the function sumOfFactors(int) and displays the result
with an appropriate message
Specify the class Perfect, giving details of the constructor, int sumOfFactors(int) and void
check().
Define the main() function to create an object and call the functions accordingly to enable
the task.
1 import java.util.*;

2 class Perfect
3 {//start of class
4 int num;

5 Perfect(int n)

572 Touchpad Computer Science (Ver. 3.0)-XI