2018 Multi-University Training Contest 6 oval-and-rectangle

#include<stdio.h>
#include<iostream>
#include<math.h>
using namespace std;
#define PI (acos(-1.0))
int main()
{
    int t;
    double a, b;
    scanf("%d", &t);
    while (t--)
    {
        scanf("%lf%lf", &a, &b);
        double sum = a * PI + 2 * b;
        long long ans = sum * 1000000;
        sum = (double)(ans) / 1000000;//截断  
        printf("%.6lf\n", sum);
    }
}