>>410

#include <stdio.h>
#include<math.h>

typedef struct{
double x;
double y;
}dot;

double myDistance(double x1, double y1, double x2, double y2){
return(sqrt(pow(x2-x1,2)+pow(y2-y1,2)));
}

int main(void)
{
dot p;
dot q;
printf("点p=(x1,y1)\n");
printf("x1:");scanf("%lf",&p.x);
printf("y1:");scanf("%lf",&p.y);
printf("点q=(x2,y2)\n");
printf("x2:");scanf("%lf",&q.x);
printf("y2:");scanf("%lf",&q.y);
printf("p-q間の距離は%fです。\n",myDistance(p.x,p.y,q.x,q.y));
return 0;
}