#include <stdio.h>
#include "round.h"
#define N 100 

int main()
{
     static volatile double a[N],b[N];
     double cl,cu;
     int i;
     cl=cu=0.;
     for(i=0; i<N; ++i)
          a[i]=b[i]=0.1;
     down();
     for(i=0;i<N;++i) 
          cl += a[i]*b[i];
     up();
     for(i=0;i<N;++i)
          cu += a[i]*b[i];
     printf("c is in [%25.18lg,%25.18lg]\n",cl,cu);
     return(0);
}