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Mystic Number Checker Guide

The document describes a program to check if a number is a mystic number. A mystic number is one where the sum of its digits is equal to 3. The program includes a Mystic class with methods to input a number, calculate the sum of its digits, and check if it is a mystic number. Main method creates a Mystic object, takes user input, calls the methods to check and display the result.

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180 views6 pages

Mystic Number Checker Guide

The document describes a program to check if a number is a mystic number. A mystic number is one where the sum of its digits is equal to 3. The program includes a Mystic class with methods to input a number, calculate the sum of its digits, and check if it is a mystic number. Main method creates a Mystic object, takes user input, calls the methods to check and display the result.

Uploaded by

monalisa
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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PROGRAM I:

A MYSTIC NUMBER IS A NUMBER IN WHICH THE


EVENTUAL SUM OF THE DIGITS IS EQUAL TO
THREE.
Example : 984 is a mystic number because
. 9 + 8+4 =21=2+1=3
DESIGN A CLASS TO INPUT A NUMBER AND FIND
WHETHER IT IS A MYSTIC NUMBER OR NOT.
INCLUDE THE FOLLOWING MEMBERS:
INSTANCE VARIABLES:
 int n
INSTANCE METHODS:
 public Mystic()-Default constructor to initialize n to 0
 public void fillNum(int num) – to assign value to n
 public intsumOfDigits() – to find the sum of the digits
of the number
 public boolean isMystic() – to check whether the
number is mystic or not and display appropriate
message.
Write a main method the create an object and call the
above methods accordingly.
SOURCE CODE:
OUTPUT:
VARIABLE LISTING:
SCOPE : public class Mystic
VARIABLE VARIABLE PURPOSE
NAME TYPE
n int To store the inputted number

SCOPE: public void fillNum( )


VARIABLE VARIABLE PURPOSE
NAME TYPE
num int Formal parameter; to store the
value to be assigned to n

SCOPE: public int sumOfDigits( )


VARIABLE VARIABLE PURPOSE
NAME TYPE
copy int To store a copy of n on which
the operations would be carried
out
sum int To store the sum of the digits

SCOPE: public boolean isMystic( )


VARIABLE VARIABLE PURPOSE
NAME TYPE
flag boolean To store the result after
condition checking
SCOPE: public static void main (String [] args)
VARIABLE VARIABLE PURPOSE
NAME TYPE
obj Mystic Refers to class object; used to
call instance methods
scan Scanner Refers to Scanner object used
to take keyboard input
num int To store the number inputted
by the user

ALGORITHM:
public static void main(String [] args):
1. Start
2. Scanner object is created
3. object of the class Mystic is created
4. num is taken as input
5. if num<0(num is negative);
then, “Wrong input” is printed
Go to 10.
6. fillNum(num) method is called
7. if value returned by isMystic() method = true,
then, it is displayed as a mystic number
8. else, it is displayed as not a mystic number.
9. endif
10. end
public void fillNum(int num):
1. Start
2. The parameter num is assigned to the instance variable n
3. End
public boolean isMystic():
1. Start
2. boolean variable flag is initialized to false
3.if 3= value returned by the method sumOfDigits( ),
then, flag is set to true
4. value of flag is returned to calling method
5. End
public int sumOfDigits( ):
1. Start
2. copy is initialized to n and sum to 0.
3. if copy>0,
then repeat steps 4 to 5.
4. the last digit of copy is added to the previous sum.
5. the value of copy is divided by 10
6. go to 3
7. if sum >=10,
then repeat steps 8 to 10.
8. copy is initialized to sum and sum to 0.
9. repeat steps 3 to 6.
10. go to 7
11.the value of sum is returned.
12. End.

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