#include "stdio.h"
  #include "log2.c"
  main()
  { int n;
    double a[7];
    static double x[10]={0.1,1.0,3.0,5.0,8.0,10.0,
                             20.0,50.0,80.0,100.0};
    static double y[10]={0.1,0.9,2.5,4.0,6.3,7.8,
                              14.8,36.0,54.0,67.0};
    n=10;
    log2(n,x,y,a);
    printf("\n");
    printf("a=%13.7e   b=%13.7e  \n",a[1],a[0]);
    printf("\n");
    printf("q=%13.7e   s=%13.7e  \n",a[2],a[3]);
    printf("\n");
    printf("umax=%13.7e  umin=%13.7e  u=%13.7e \n",
                           a[4],a[5],a[6]);
    printf("\n");
  }