switch does not work?

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at the below program.
case zero does not work and Alert("ITERATION................0")  does not realize.
but case 1 occurs continuously.
why does not case zero does not work ?


//VELOCITY//

////////////////////////////////////////////
////////--- VELOCITY_ASAGI>VELOCITY_YUKARI (EN AZ UC KEZ)
////////    YON_ASAGI=1,YON YUKARI=0
////////    SAT

////////--- VELOCITY_YUKARI>VELOCITY_ASAGI (EN AZ UC KEZ)
////////    YON YUKARI=1,YON_ASAGI=0
////////    AL       
////////

extern double  VELOCITY_ASAGI,VELOCITY_YUKARI;
extern bool    YON_ASAGI,YON_YUKARI;
extern double price1,price2;
double time1,time2;
int n=0;
double fiyat_farki;
double zaman_farki;

int start()
{
Print("zaaaaaman","  ",GetTickCount());  


switch(n)


{
case 0:
Alert("ITERATION................0");
price1=100000*(Bid);
time1=GetTickCount();
Print("price1","  ",price1);
Print("time1","   ",time1);
n++;
break;


case 1:
Alert("ITERATION................1");
price2=100000*(Bid);
time2=GetTickCount();
Print("price2","  ",price2);
Print("time2","   ",time2);
fiyat_farki=price2-price1;
zaman_farki=time2-time1;
Print("fiyat farkı","  ",1000*fiyat_farki);
Print ("zaman farki","  ",1000*zaman_farki);
Print("HIZ","  ",fiyat_farki*1000/zaman_farki);

n=0;
break;

default:Print("aksi hal");
break;


}
return;
}
 
pascalboy:

at the below program.

case zero does not work and Alert("ITERATION................0") does not realize.

but case 1 occurs continuously.

Case zero does work . . . see for yourself.

2013.07.23 18:26:27 pascalboy1 GBPUSD,H1: Alert: ITERATION................1

2013.07.23 18:26:27 pascalboy1 GBPUSD,H1: zaaaaaman -371987799

2013.07.23 18:26:23 pascalboy1 GBPUSD,H1: time1 -371991621

2013.07.23 18:26:23 pascalboy1 GBPUSD,H1: price1 153740

2013.07.23 18:26:23 pascalboy1 GBPUSD,H1: Alert: ITERATION................0

2013.07.23 18:26:23 pascalboy1 GBPUSD,H1: zaaaaaman -371991621

2013.07.23 18:26:17 pascalboy1 GBPUSD,H1: HIZ -6.9841

2013.07.23 18:26:17 pascalboy1 GBPUSD,H1: zaman farki 1575000

2013.07.23 18:26:17 pascalboy1 GBPUSD,H1: fiyat farki -11000

2013.07.23 18:26:17 pascalboy1 GBPUSD,H1: time2 -371998158

2013.07.23 18:26:17 pascalboy1 GBPUSD,H1: price2 153732

2013.07.23 18:26:17 pascalboy1 GBPUSD,H1: Alert: ITERATION................1

2013.07.23 18:26:17 pascalboy1 GBPUSD,H1: zaaaaaman -371998158

2013.07.23 18:26:15 pascalboy1 GBPUSD,H1: time1 -371999733

2013.07.23 18:26:15 pascalboy1 GBPUSD,H1: price1 153743

2013.07.23 18:26:15 pascalboy1 GBPUSD,H1: Alert: ITERATION................0

2013.07.23 18:26:15 pascalboy1 GBPUSD,H1: zaaaaaman -371999765

2013.07.23 18:26:05 pascalboy1 GBPUSD,H1 inputs: VELOCITY_ASAGI=0; VELOCITY_YUKARI=0; YON_ASAGI=false; YON_YUKARI=false; price1=0; price2=0;

2013.07.23 18:26:04 pascalboy1 GBPUSD,H1: loaded successfully


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