求水仙花数写法的详细解释

# include <stdio.h>
# include <math.h>

bool IsNarcissus (int number);
int n=3;   

int main()
{
    int i;
    for(i=pow(10,n-1); i<pow(10,n); ++i)
    {
        if (IsNarcissus (i))
        {
            printf("%d \n",i);
        }   
    }
    return 0;
}

bool IsNarcissus (int number)
{
    int sum=0;
    int x=number;
    while(x!=0)
    {
        sum += pow((x%10),n);
        x /= 10;
    }
    if (sum == number)
    {
        return true;
    }
    else
    {
        return false;
    }
}


求写法的详细解释