这个方法非常简单，求赞

#include<bits/stdc++.h>
using namespace std;
int main(){
double a,b,bmi;
cin>>a>>b;
bmi=b/(a*a);
printf("%0.2f",bmi);
if(bmi>=18.5&&bmi<=23.9)
cout<<" "<<"normal";
else if(bmi<=18.5)
cout<<" "<<"thin";
else if(bmi>=23.9)
cout<<" "<<"obese";
return 0;
}