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为什么我这段代码用C++提交才可以,C就不行(错误原因说是标识符未声明)

Posted by SummerJY at 2014-04-20 12:35:05 on Problem 1005
#include<stdio.h>
const double PI=3.141592654;
int main()
{

    int n;
    scanf("%d",&n);
    int i=1;
    for(i=1;i<=n;i++)
    {
        double x,y;
        scanf("%lf%lf",&x,&y);
        double Area;
        Area=0.5*PI*(x*x+y*y);
        int year;
        year=(int)(Area/50.0+1.0);
        printf("Property %d: This property will begin eroding in year %d.",i,year);
        printf("\n");

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

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