POJ-1005: I Think I Need a Houseboat 详解1: 直接计算

 1 #include "stdio.h"
 2 
 3 #define PI 3.14f
 4 
 5 int main(void)
 6 {
 7     int n = 0 ;
 8     int i = 0 ;
 9     float x = 0.0, y = 0.0;
10     int years = 0 ;
11 
12     scanf("%d", &n) ;
13 
14     for(i = 0; i < n; i++)
15     {
16         scanf("%f %f", &x, &y) ;
17         years = (int)(PI * (x * x + y * y) / 2 / 50) + 1;
18 
19         printf("Property %d: This property will begin eroding in year %d.\r\n", 
20             i + 1, years) ;
21     }
22 
23     printf("END OF OUTPUT.\r\n") ;
24     return 0 ;
25 }