POJ_1005(I Think I Need a Houseboat)解题报告

//POJ_1005

#include <stdio.h>
#include <math.h>

const float PI = 3.1415926;

int main(void)
{
    int num;//num of data

    int loop;
    float x, y;
    float *area;//semicircle's area

    
    scanf("%d", &num);
    area = (float *)malloc(sizeof(float) * num);
    
    for(loop=0; loop<num; loop++)
    {
     scanf("%f %f", &x, &y);
        area[loop] = (x * x + y * y ) * PI / 2;
    }
    
    for(loop=0; loop<num; loop++)
    {
         printf("Property %d: This property will begin eroding in year %.0lf.\n", loop+1, ceil(area[loop] / 50)); //ceil from math.h        

     }
       printf("END OF OUTPUT.");
    return 0;
}


注：学会使用中的ceil()和floor()，一个是向上取整一个是向下取整。