#include "stdio.h"
  #include "4sdet.c"
  main()
  { static double a[4][4]={ {1.0,2.0,3.0,4.0},
                            {5.0,6.0,7.0,8.0},
                            {9.0,10.0,11.0,12.0},
                            {13.0,14.0,15.0,16.0}};
    static double b[4][4]={ {3.0,-3.0,-2.0,4.0},
                            {5.0,-5.0,1.0,8.0},
                            {11.0,8.0,5.0,-7.0},
                            {5.0,-1.0,-3.0,-1.0}};
    double det;
    det=sdet(a,4);
    printf("det(A)=%13.7e\n",det);
    printf("\n");
    det=sdet(b,4);
    printf("det(B)=%13.7e\n",det);
    printf("\n");
  }