C program that check whether given number is Happy or not - My CS Tutorial

C program to check that given number is Happy  or not.

In this tutorial we will learn how to write a program that check given number is Happy or not.

EXPLANATION:-

A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squares of its digits, and repeat the process until the number either equals 1 (where it will stay), or it loops endlessly in a cycle that does not include 1.

If it is not happy number it will end at '4'. 

For Ex:- To check whether 19 is happy or not 

19=1^2+9^2=82 then we take 82 

82=8^2+2^2=68 then again we take 65

68=6^2+8^2=100

100=1^2+0^2+0^2=1

So it is Happy Number

If the number is not happy then it will end at 4. 

C program code

#include<stdio.h>

#include<conio.h>

#include<math.h>

void main()

{

 int i,j,num,temp,sum=0;

 printf("\n Enter a number:\n ");

 scanf("%d",&num);

  while(sum!=1 && sum!=4)

  {

   sum=0;

   while(num>0)

  {

    j=num%10;

    sum+=(j*j);

    num=num/10;

  }

  num=sum;

  }

 if(sum==1)

 printf("\n Given number is a Happy Number.\n");

 else

 printf("\n Given number is an UnHappy Number.\n");

 getch();

}

OUTPUT 1:

OUTPUT 2:

In first output,the value of number is 763

The given number is a Happy number.

In second output,the value of number is 200

The given number is an Unhappy number.

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Created by-- HARSH CHAUHAN