Miért fagy le ha ezt elindítom?

# include <iostream>

# include <windows.h>

# include <stdio.h>

using std::cout;

using std::cin;

using std::endl;

using std::string;

int main(int argc, char *argv[])

{

int a;

string array [9] = {"A","B","C","D","E","F","G","H","I"};

system("TITLE the MAtrix");

system("color 0A");

while(1)

{

Sleep(25);

for(int i = 0; i < 20; i++)

{

a = rand()%42;

cout <<" " << array[a]; //1 BLANK

cout <<" ";//2 BLANKS

}

cout << endl;

}

getchar();

return 0;

}