poj 3100 Root of the Problem

#include <iostream>#include <cstdlib>#include <cstdio>#include <cstring>#include <cmath>using namespace std;int main(){    int b, n;    while (scanf("%d%d", &b, &n) != EOF && !(b == 0 && n == 0))    {        double a = pow(b, 1.0 / n);        int a1, a2;        a1 = (int) floor(a);        a2 = (int) ceil(a);        int d1 = abs((int) pow((double) a1, n) - b);        int d2 = abs((int) pow((double) a2, n) - b);        if (d1 > d2) printf("%dn", a2);        else printf("%dn", a1);    }    return 0;}