#include <stdio.h>
#include <math.h>


float dist( float x, float y) {

  float d; 
  d = sqrt( x*x + y*y );

  return d;
}

int main() {

  float a=3.0, b=4.0, c;

  c = dist(a, b);
  printf ( "c = %f\n", c);

  return 0;
}