C program to calculate Armstrong Number between 100 - 999

/* C program to  find Armstrong Numbers between 100 and 999 */

void main()
{
    int i,n,sum,r;
    
    printf("\nThe ARMSTRONG numbers from 100-999 are: ");
    i = 100;
    while(i <= 999)
    {
        sum = 0;
        n = i;
        while(n > 0)
        {
            r = n % 10;
            sum = sum + (r * r * r);
            n = n / 10;
        }
        if(i == sum)
        printf("\n\t\t\t\t\t%d",i);
        i = i + 1;
    }
}

Output