Неправильно работает if

//---------------------------------------------------------------------------
 
#include <vcl.h>
#pragma hdrstop
 
#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------
 
void __fastcall TForm1::FormCreate(TObject *Sender)
{
Edit1->Text="0,1";
Edit2->Text="0,2";
Edit3->Text="0,3";
Memo1->Clear();
}
//---------------------------------------------------------------------------
 
void __fastcall TForm1::Button1Click(TObject *Sender)
{
double x,y,z,u,m;
 
x=StrToFloat(Edit1->Text);
Memo1->Lines->Add("x="+Edit1->Text);
 
y=StrToFloat(Edit2->Text);
Memo1->Lines->Add("y="+Edit2->Text);
 
z=StrToFloat(Edit3->Text);
Memo1->Lines->Add("z="+Edit3->Text);
 
 m=x+y+z;
 
if (m<1)
{ if ((x<z)+(x<y)) {u=z+y;} else
  {if ((y<z)+(y<x)) {u=x+z;} else {u=x+y;}}
} else {if (x>y) {u=(x+z)/2;} else {u=(y+z)/2;}}
 
Memo1->Lines->Add("u="+FloatToStrF(u,ffFixed,8,2));
Memo1->Lines->Add("m="+FloatToStrF(m,ffFixed,8,2));
}
//---------------------------------------------------------------------------

else
  {if ((y<z)+(y<x)) {u=x+z;} else {u=x+y;}}

{if ((y<z)&&(y<x)) {u=x+z;} else {u=x+y;}}