C++ Random

//---------------------------------------------------------------------------
#include <iostream.h>
#include <conio.h>
#include <vcl.h>
#include <cstdlib.h>
#include <time.h>
#pragma hdrstop
int a[8];
int x;
 
#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma link "sButton"
#pragma link "sListBox"
#pragma link "sRadioButton"
#pragma link "sLabel"
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
for(int i=0;i>8;i++)
{
a[i]='0';
}
}
//---------------------------------------------------------------------------
 
 
void __fastcall TForm1::sButton1Click(TObject *Sender)
{
char v1[20] = "1?";
char v2[20] = "2?";
char v3[20] = "3?";
char v4[20] = "4?";
char v5[20] = "5?";
char v6[20] = "6?";
char v7[20] = "7?";
srand (time(NULL));
x=rand()%8;
if(a[x]='0')
{
switch(x)
 {
 case 0:sLabel1->Caption=v1;
 a[x]='1';
 break;
 case 1:sLabel1->Caption=v2;
 a[x]='1';
 break;
 case 3:sLabel1->Caption=v3;
 a[x]='1';
 break;
 case 4:sLabel1->Caption=v4;
 a[x]='1';
 break;
 case 5:sLabel1->Caption=v5;
 a[x]='1';
 break;
 case 6:sLabel1->Caption=v6;
 a[x]='1';
 break;
 case 7:sLabel1->Caption=v7;
 a[x]='1';
 break;
 }
}
else
{
}
}
 
//---------------------------------------------------------------------------