p2original.c

#include<stdio.h>
void input_line(float *x1,float *y1,float *x2,float *y2,float *x3,float *y3)
{
  printf("enter the position of point x1,y1,x2,y2,x3,y3\n");
  scanf("%f%f%f%f%f%f",x1,y1,x2,y2,x3,y3);
}
int is_triangle(float x1,float y1,float x2,float y2,float x3,float y3)
{
  float area;
 area=0.5*((x1*(y2-y3))*(x2*(y3-y1))*(x3*(y1-y2)));
  return area;
}
void output(float x1,float y1,float x2,float y2,float x3,float y3,float area)
{
  if(area>0)
    printf("the points %f,%f and %f,%f and %f%f form a triangle\n ",x1,y1,x2,y2,x3,y3);
      else
      printf("the points %f,%f and %f,%f and %f,%f doesnt form a triangle\n ",x1,y1,x2,y2,x3,y3);
}
    void main()
      {
      float a,b,c,d,e,f,result;
      input_line(&a,&b,&c,&d,&e,&f);
      result=is_triangle(a,b,c,d,e,f);
      output(a,b,c,d,e,f,result);
      }