UVA 11346(p334)----Probability

//注意精度！！！#include<iostream>#include<cstdio>#include<cmath>using namespace std;int main(){  double a,b,s;  int n;  scanf("%d",&n);  for(int i=0;i<n;i++)  {    scanf("%lf%lf%lf",&a,&b,&s);    if(-0.000001<=s&&s<=0.0000001){printf("100.000000%%\n");continue;}    double temp1=a*b-s;    if(temp1<0){printf("0.000000%%\n");continue;}    double temp2=s*log(a*b/s);    double ans=((temp1-temp2)/(a*b))*100;    printf("%.6lf%%\n",ans);  }  return 0;}