学步园

#include<stdio.h>
double PI=3.1415926;//这个必须是这个数
int main()
{
    int t,year,i=0;
    double x,y,area;
    scanf("%d",&t);
    while(t--)
    {
        i++;
        scanf("%lf%lf",&x,&y);
        area=PI*(x*x+y*y)/2.0;//求出平均面积
        year=(int)(area/50.0);//注意再转型的时候那对括号,不会四舍五入
            if(area/50.0-year>0)
            year+=1;

       printf("Property %d: This property will begin eroding in year %d.\n", i, year);  
    }
    printf("END OF OUTPUT.\n");
    return 0;
}