Thread: What is wrong with this funtion!?

Code:

//#includes and blablabla...

double radius_circ (double a, double b, double c)
{
    double semi_per;
    semi_per = (a + b + c) / 2;
    double result;
    result = (a * b * c) / (4 * (sqrt (semi_per * ((semi_per - a) * (semi_per - b) * (semi_per - c )))));
    return result;
}

void run_this (void)
{
  double a;
  double b;
  double c;
  while (scanf ("%lf%lf%lf", &a, &b, &c) != EOF)
  {
    double z = radius_circ (a, b, c);
    printf ("%0.6f\n", z);
  }
}

//main run_this...

Objective:

Program a function that computes the radius of the circle circumscribed in a triangle, given the lengths of the sides. Use the formula r = abc / 4 (sqrt (s (s-a) (s-b) (s-c)), where a, b and c represent the sides and s represents the semi-perimeter.

http://www.efunda.com/math/areas/ima...CircleGen1.gif
http://www.efunda.com/math/areas/ima...CircleGen2.gif

you do not have * (multiplication) in every place you want to multiply 2 value.

Compiler cannot read your mind - you need to write everything you want it to do.

Also what will happen if scanf returns 0, 1 or 2?

You missed vart's point. scanf() does not only return EOF to report problems.

What do you expect to happen if a negative value is passed to sqrt()? How many real triangles with have a size with zero length?