> #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;
> }

• Re: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） (523) SummerJY 2014-04-20 12:46:47