代码如下

#include <iostream>
#include <iomanip>
#include <cmath>

using namespace std;

int main() {
    double m, h;
    cin >> m >> h;
    double bmi = m / pow(h, 2);

    if (bmi < 18.5) {
        cout << "Underweight" << endl;
    } else if (bmi >= 18.5 && bmi < 24) {
        cout << fixed << setprecision(6) << bmi << endl;
        cout << "Normal" << endl;
    } else {
        cout << fixed << setprecision(6) << bmi << endl;
        cout << "Overweight" << endl;
    }

    return 0;
}

这是怎么回事？？