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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)#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; } Followed by:
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