text: #include <stdio.h>
  
  double garm(double, double);
  
  int main(void)
  {
      double a,b,c;
      printf("Enter double number #1 and #2:");
      scanf("%lf %lf", &a, &b);
      c=garm(a,b);
      printf("Medium garmon = %f\n", c);
  
      return 0;
  }
  
  double garm(double x, double y)
  {
      double z;
      z=2/((1/x)+(1/y));
  
      return z;
  }
  