C program to print all Happy number between 1 to 100 or N - My CS Tutorial

In this tutorial we will learn how to write a program that print all Happy number between one to hundred(1 to 100).we will write a program to print all integers till N.

C program code

#include<stdio.h>

#include<conio.h>

#include<math.h>

void main()

{

 int a,b,num,x,temp,sum=0;

 printf("\n Enter number till what you want happy numbers to be displayed:\n ");

 scanf("%d",&x);

   for(a=1;a<=x;a++)

   {

    sum=0;

    num=a;

    temp=num;

     while(sum!=1 && sum!=4)

  {

   sum=0;

   while(num>0)

  {

    b=num%10;

    sum+=(b*b);

    num=num/10;

  }

  num=sum;

  }

  if(sum==1)

  {

   printf("\n %d",a);

  }

   }

   getch();

}

OUTPUT 1:

OUTPUT 2:

In first output, the value of input number is 35
The Happy numbers between 1 to 35 is
1, 7, 10, 13, 19, 23, 28, 31, 32


In second output,the value of input number is 25
The Happy numbers between 1 to 25 is
1, 7, 10, 13, 19, 23

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Created by-- HARSH CHAUHAN