Happy Number solution using c language--programming_info problem 24

Happy Number:

#include <stdio.h>    

     

//isHappyNumber() will determine whether a number is happy or not    

int isHappyNumber(int num){    

    int rem = 0, sum = 0;    

        

    //Calculates the sum of squares of digits    

    while(num > 0){    

        rem = num%10;    

        sum = sum + (rem*rem);    

        num = num/10;    

    }    

    return sum;    

}    

        

int main()    

{    

    int num = 82;    

    int result = num;    

        

    while(result != 1 && result != 4){    

        result = isHappyNumber(result);    

    }    

        

    //Happy number always ends with 1    

    if(result == 1)    

        printf("%d is a happy number", num);    

    //Unhappy number ends in a cycle of repeating numbers which contains 4    

    else if(result == 4)    

        printf("%d is not a happy number", num);     

     

    return 0;    

}

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