C PROGRAM FOR HAPPY NUMBER OR NOT

   

 

Consider the following I/O samples.

SAMPLE INPUT: 5544

SAMPLE OUTPUT: NOT A HAPPY NUMBER

A number is called a HAPPY NUMBER is it leads to 1 after a sequence of steps i.e., by performing the sum of squares of its digits.

32 = 3^2 + 2^2 =13

13 = 1^2 + 3^3 = 10

10 = 1^2 + 0^2 = 1

C PROGRAM:

#include<stdio.h>

int main()

{

    int n,sum=0,rem=0;

    scanf("%d",&n);

    printf("\n");

    do

    {

        sum=0;

        while(n)

        {

            rem=n%10;

            sum=sum+(rem*rem);

            n=n/10;

        }

        n=sum;

    }

    while(sum>9);

    if(sum==1)

        printf("HAPPY NUMBER");

    else

        printf("NOT A HAPPY NUMBER");

    return 0;

}

OUTPUT:

The given source code in C program "FOR HAPPY NUMBER OR NOT" is short and simple to understand. The source code is well tested in DEV-C++ and is completely error free. 

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