第二章第9题

#include<stdio.h>
int main()
{
    float x,y,a;
    char k='A';
 int i=1;
        printf("请输入x和y:\n");
    while(i<=3)
    {  
     scanf("%f%f",&x,&y);
              a=(x-2)*(x-2)+(y-2)*(y-2);
           if(a<1)
              printf("%c在圆内\n",k);
           else if(a==1)
              printf("%c在圆周上\n",k);
           else
              printf("%c在圆外\n",k);
     i++;
 }
        return 0;

}