http://poj.org/problem?id=1005
#include<stdio.h> #include<string.h> #include <math.h> const double pi = acos(-1.0); int main() { int t,j; scanf("%d",&t); for (int i = 1;i <= t;i ++) { double x,y,r; int cnt = 1; scanf("%lf%lf",&x,&y); r = x*x+y*y; for (j = 50;;j = j+50) { if (j >= 1.0/2*(pi*r)) break; cnt++; } printf("Property %d: This property will begin eroding in year %d. ",i, cnt); } puts("END OF OUTPUT."); return 0; }