Right angle triangle test with three points

#include<stdio.h>

# include <stdlib.h>

# include <math.h>

int test(struct Point *p1,struct Point *p2,struct Point*p3)

{

    double x1,x2,x3,y1,y2,y3;

    x1=p1->x;

                y1=p1->y;

                x2=p2->x;

                y2=p2->y;

                x3=p3->x;

                y3=p3->y;

double a=sqrt(pow((y2-y1),2.0)+pow(x2-x1,2.0));

double b=sqrt(pow((y3-y2),2.0)+pow(x3-x2,2.0));

double c=sqrt(pow((y3-y1),2.0)+pow(x3-x1,2.0));

 if(a<(b+c)&&b<(a+c)&&c<(a+b))

    {

      

        if((a*a)==(b*b)+(c*c)||(b*b)==(a*a)+(c*c)||(c*c)==(a*a)+(b*b))

        return 1;

    }

    else

    return 0;

  

}

main()

{

   struct  Point *p1,*p2,*p3;

    p1->x=6.0;

    p2->x=4.0;

    p3->x=10.0;

    p1->y=1.0;

     p2->y=5.0; p3->y=3.0;

   

    printf("%d",test(p1,p2,p3));

}