那就贴个C语言的，供参考：
#include<stdio.h>
#define PI 3.1415926
int main()
{
	int i,n,s;
	float x,y,v;
	scanf("%d",&n);
	for(i=0;i<n;i++)
	{
		scanf("%f%f",&x,&y);
		v=(PI*(x*x+y*y)/2)/50;
		s=v;
		if(v==s)
		    printf("Property %d: This property will begin eroding in year %d.\n",i+1,s);
		if(v>s)
			printf("Property %d: This property will begin eroding in year %d.\n",i+1,s+1);
		if(i==n-1)
		    printf("END OF OUTPUT.\n");
	}
	return 0;
}