andy6804tw
10/12/2016 - 2:07 AM

http://e-tutor.itsa.org.tw/e-Tutor/mod/programming/view.php?id=30749

#include<stdio.h>    
#include<math.h>    
int main(){       
  double x,y;  
  scanf("%lf%lf",&x,&y);  
  if(sqrt(x*x+y*y)<=200)  
    printf("inside\n");  
  else   
    printf("outside\n");  
}