#include <stdio.h>

#define N 10

int   main()

{        double   x[N]={1.1,2.2,3.3,4.4,5.5,6.6,7.7,8.8,9.0,9.9}

           int    i;

          double   *pf,*pt;

         void  swap(double *, double *);

        for  ( pf=x, pt=&x[N-1}; pf<pt; ++pf,__pt)

             swap(pf,pt);

        for (i=0;i<N;++i)

            printf("\nx[%d]=%f,"i,x[i]);

            return(0);

}

void   swap(  double *px,  double *py)

{                 double   temp;

                   temp=*px;

                   *px=*py;

                   *py=temp;

}

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