/*    file :  twocross.c
 *
 *    purpose : implemnet of two-point crossover
 *
 */
#include <stdlib.h>
#include <time.h>
#include <stdio.h>

void
twocross(Kid1,Kid2,len)
int 	len;			/* the length of the vector */
int	*Kid1;			/* pointer to crossover partners */
int	*Kid2;
{
	int 	Fir,		/* first crossover-position */
			  Sec,		/* second crossover-position */
		i;


	int	Tmp;		/* used for swapping alleles */

	int	tmp;		/* used for swapping the crossover points */

	randomize();
	Fir=random(len);	/* choose the first crossover point */

	Sec=random(len);	/* choose the second crossover point */
	Sec=(2*Sec)%len;

		  /* sort crossover points */
	if (Fir>=Sec)
	{
		tmp=Fir;
		Fir=Sec;
		Sec=tmp;
	}

	/* crossover through exchanging information */

	for (i=Fir; i<Sec;i++)
	{
		Tmp=Kid1[i];
		Kid1[i]=Kid2[i];
		Kid2[i]=Tmp;
	}/* end for */
} /* end 2cross */