#include "stdio.h"
  #include "14gass.c"
  main()
  { int i,j;
    double a0,d0,x,y;
    static double a[2]={ -1.0,3.0};
    static double d[2]={ 0.5,15.0};
    printf("\n");
    for (i=0; i<=1; i++)
      { a0=a[i]; d0=d[i]; x=-10.0;
        for (j=0; j<=4; j++)
          { y=gass(a0,d0,x);
            printf("P(%4.2f, %4.2f, %4.2f)=%e\n",a0,d0,x,y);
            x=x+5.0;
          }
      }
    printf("\n");
  }