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到底是什么错啊？？有高手能告诉我吗？？谢谢啊#include <iostream.h>
#include <stdio.h>
#include<math.h>
void main(){
int t, n, i;
long double R, PI, k;
PI = acos(-1);
cin>>t;
for(i=1; i<=t;++i){
cin>>R>>n;
cout<<"Scenario #"<<i<<":"<<endl;
k = PI/n;
k = (sin(k) + sin(PI-k))/2;
k = k/(1+k);
if(n==2) printf("%.3llf\n\n",R/2);
else printf("%.3llf\n\n",R*k);
}
}
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