#include<stdio.h>
typedef struct myPoint
{
    double x;
    double y;
}myPoint; 
int main()
{
    myPoint point;
    int r;
    printf("請(qǐng)輸入一個(gè)點(diǎn)的x，y位置：");
    scanf("%lf%lf",&point.x,&point.y);
    printf("請(qǐng)輸入一個(gè)半徑：");
    scanf("%d",&r);
    if(point.x*point.x+point.y*point.y<=r*r)
    {
        printf("在圓內(nèi)\n");
    }
    else
    {
        printf("不在圓內(nèi)\n");
    } 
    return 0;
}