#include <stdio.h>

int isAbove(
int x,       /* coordinates of test point */
int y,
int x0,      /* coordinates of one point on the line */
int y0,
int x1,      /* coordinates of another point on line */
int y1)
{
   float slope;
   float yval;
   int   out;

   slope = y1 - y0;
   slope = slope / (x1 - x0);

   yval = y0 + slope * (x - x0);

   if (yval > y)
      out = 0;
   else
      out = 1;

   return(out);
}

main()
{
   printf("%d\n", isAbove(50, 53, 0, 0, 100, 100));
   printf("%d\n", isAbove(50, 47, 0, 0, 100, 100));
   printf("%d\n", isAbove(50, 52, 0, 100, 100, 0));
   printf("%d\n", isAbove(50, 48, 0, 100, 100, 0));
}