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pi = acos(-1);试试In Reply To:哪位高手帮忙下呀,没理由错的啊!!郁闷ING Posted by:v123 at 2006-04-24 18:21:08 > #include<iostream>
> #include<math.h>
> using namespace std;
> void main()
> {
> int n,i=1;
> cin>>n;
> for(i=1;i<n+1;i++)//while(n--)
> {
> double R;
> int num;
> cin>>R>>num;
> double r=0.0,t=0.0;
> double pi=3.1415926;
> t=sin(pi/num);
> r=R*t/(t+1.0);
> printf("Scenario #%d:\n%.3f\n\n",i,r);
> }
> }
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