UVA 10491(p326)----Cows and Cars

#include<cstdio>#include<iostream>using namespace std;int main(){    double a,b,c;    while(scanf("%lf%lf%lf",&a,&b,&c)==3)    {        double ans1=(a/(a+b))*(b/(a+b-1-c));        //cout<<ans1<<endl;        double ans2=(b/(a+b))*((b-1)/(a+b-1-c));       // cout<<ans2<<endl;        printf("%.5lf\n",ans1+ans2);    }    return 0;}