Struct

#include<stdio.h>
#include<math.h>
struct point{
int x;
int y;
};
int main()
{
    struct point p1[10],p2[10];
    double d[10];
    int i;
    for(i=0;i<=2;i++){
        scanf("%d%d%d%d",&p1[i].x,&p1[i].y,&p2[i].x,&p2[i].y);
        d[i] = sqrt((p1[i].x - p2[i].x) * (p1[i].x - p2[i].x) + (p1[i].y - p2[i].y) * (p1[i].y - p2[i].y));
        printf("%lf\n",d[i]);
    }
    return 0;
}