#include<stdio.h>
#include<math.h>
struct point
{float x;
 float y;
};
int main()
{struct point po1,po2;
 float s;
 int flag=0;
 printf("请输入点1（x，y）：\n");
 scanf("%f%f",&po1.x,&po1.y); 
 printf("请输入点2（x，y）：\n");
 scanf("%f%f",&po2.x,&po2.y);
 if((po1.x!=po2.x)||(po1.y!=po2.y))
 {flag=0;
 }
 s=sqrt((po1.x-po2.x)*(po1.x-po2.x)+(po1.y-po2.y)*(po1.y-po2.y));
 if(flag==1)
 {printf(" 两点间距离是:%f,在同一象限\n",s);
	 }	
 else
 {printf(" 两点间距离是:%f,不在同一象限\n",s);
 }
 return 0;
}