UVa11646

http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=2693

水题，但是是special judge的第一题

#include<cstdio>
#include<cmath>

using namespace std;

int main()
{
    int a, b, count_ = 1;
    char c[10];
    while(scanf("%d%s%d", &a, &c, &b) == 3)
    {
        double R = sqrt(b*b+a*a)/2;
        double theta = 2*asin(b/(2*R));
        double p = theta*R + a;
        printf("Case %d: %.8f %.8f\n", count_++, 200*a/p, 200*b/p);
    }
    return 0;
}