or some like this in C:
Code:
 #include <stdlib.h>
#include <stdio.h>
#include <string.h>

typedef unsigned short USHORT;

#define BIN_LEN   30
#define FALSE      0
#define TRUE      !FALSE

int SearchThreeRepeats( USHORT i, char *BinStr )
{
  USHORT p = 1;
  char   Buf[(BIN_LEN / 3) + 1],
         OldBuf[(BIN_LEN / 3) + 1] = "";
  USHORT j;

  for ( j = 0; j < BIN_LEN; j += i ) {
    strncpy( Buf, BinStr + j, i );
    Buf[i] = 0;

    if ( strcmp( OldBuf, Buf ) == NULL )
      p++;
    else
      p = 1;

    strcpy( OldBuf, Buf );

    if ( p == 3 )
      return( TRUE );
  }
  return( FALSE );
}

int CheckRepeatTriad( char *BinStr )
{
  USHORT i;
  for ( i = 1; i <= BIN_LEN / 3; i++ ) {
    if ( SearchThreeRepeats( i, BinStr ) )
      return( TRUE );
  }
  return( FALSE );
}

int main(int argc, char* argv[])
{
  USHORT i;
  char   BinStr[BIN_LEN + 1] = "";
  char   c[2];

  randomize();

  do {
    while ( TRUE ) {
      for ( i = 0; i < BIN_LEN; i++ ) {
        itoa( rand() % 2, c, 2 );
        BinStr[i] = c[0];
      }
      BinStr[BIN_LEN] = 0;
      if ( ! CheckRepeatTriad( BinStr ) )
        break;
    }
    printf( "Binary String = %s\nNew String (Y/N)?\n", BinStr );

  } while ( getch() != 'Y' );

  return 0;
}



(sorry for posting other codes :tongue:)