A happy number is a number in which the eventual sum of the square of the digits of the number is equal to 1.
Example:
28 = ( 2 )^2 + ( 8 )^2 = 4 + 64 = 68
68 = ( 6 )^2 + ( 8 )^2 = 36 + 64 = 100
100 = ( 1 )^2 + ( 0 )^2 + ( 0 )^2= 1 + 0 + 0 = 1
Hence, 28 is a happy number.
Example: 12 = ( 1 )^2 + ( 2 )^2 = 1 + 4 = 5
Hence, 12 is not a happy number.
Design a class happy to check if a given number is a happy number. Some of the members of the class are given below:
Class name : Happy
Data members/instance variable :
n : stores the number
Member functions :
Happy( ) : constructor to assign 0 to n
void getnum(int nn) : to assign the parameter value to the number n = nn
int sum_sq_digits(int x) : returns the sum of the square of the digits of the number x, using the recursive technique
void ishappy( ) : checks if the given number is a happy number by calling the function sum_sq_digits(int) and displays an appropriate message
Specify the class Happy giving details of the constructor( ), void getnum(int), int sum_sq_digits(int) and void ishappy( ). Also define a main( ) function to create an object and call the methods to check for happy number.
import java.io.*;
class Happy
{
static BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
int n;
Happy()
{
n=0;
}
void getnum(int nn)
{
n=nn;
}
int sum_sq_digits(int x)
{
if(x==0)
return 0;
else
{
int d=x%10;
return (d*d+ sum_sq_digits(x/10));
}
}
void ishappy()
{
int a=sum_sq_digits(n);
while(a>9)
{
a=sum_sq_digits(a);
}
if(a==1)
System.out.print(n+" is a Happy Number");
else
System.out.print(n+" is Not a Happy Number");
}
public static void main(String args[])throws IOException
{
Happy ob=new Happy();
System.out.print("Enter any number: ");
int b=Integer.parseInt(br.readLine());
ob.getnum(b);
ob.ishappy();
}
}
Example:
28 = ( 2 )^2 + ( 8 )^2 = 4 + 64 = 68
68 = ( 6 )^2 + ( 8 )^2 = 36 + 64 = 100
100 = ( 1 )^2 + ( 0 )^2 + ( 0 )^2= 1 + 0 + 0 = 1
Hence, 28 is a happy number.
Example: 12 = ( 1 )^2 + ( 2 )^2 = 1 + 4 = 5
Hence, 12 is not a happy number.
Design a class happy to check if a given number is a happy number. Some of the members of the class are given below:
Class name : Happy
Data members/instance variable :
n : stores the number
Member functions :
Happy( ) : constructor to assign 0 to n
void getnum(int nn) : to assign the parameter value to the number n = nn
int sum_sq_digits(int x) : returns the sum of the square of the digits of the number x, using the recursive technique
void ishappy( ) : checks if the given number is a happy number by calling the function sum_sq_digits(int) and displays an appropriate message
Specify the class Happy giving details of the constructor( ), void getnum(int), int sum_sq_digits(int) and void ishappy( ). Also define a main( ) function to create an object and call the methods to check for happy number.
import java.io.*;
class Happy
{
static BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
int n;
Happy()
{
n=0;
}
void getnum(int nn)
{
n=nn;
}
int sum_sq_digits(int x)
{
if(x==0)
return 0;
else
{
int d=x%10;
return (d*d+ sum_sq_digits(x/10));
}
}
void ishappy()
{
int a=sum_sq_digits(n);
while(a>9)
{
a=sum_sq_digits(a);
}
if(a==1)
System.out.print(n+" is a Happy Number");
else
System.out.print(n+" is Not a Happy Number");
}
public static void main(String args[])throws IOException
{
Happy ob=new Happy();
System.out.print("Enter any number: ");
int b=Integer.parseInt(br.readLine());
ob.getnum(b);
ob.ishappy();
}
}