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/*
include

double hypot ( double x , double y  );
float hypotf ( float x , float y  );
long double hypotl ( long double x , long double y  );
*/
  #include

  #include 

  int main(void)
  {

     int e;
     double f;

     f = hypotf(3, 4);
     printf("%f", f);

  }