Category : C Source Code
Archive   : RECIPEX.ZIP
Filename : XQUAD3D.C
#include
#include
#include "nr.h"
#define PI 3.1415927
#define NVAL 10
static float xmax;
float func(x,y,z)
float x,y,z;
{
return x*x+y*y+z*z;
}
float z1(x,y)
float x,y;
{
return (float) -sqrt(xmax*xmax-x*x-y*y);
}
float z2(x,y)
float x,y;
{
return (float) sqrt(xmax*xmax-x*x-y*y);
}
float yy1(x)
float x;
{
return (float) -sqrt(xmax*xmax-x*x);
}
float yy2(x)
float x;
{
return (float) sqrt(xmax*xmax-x*x);
}
main()
{
int i;
float xmin,s;
printf("Integral of r^2 over a spherical volume\n\n");
printf("%13s %10s %11s\n","radius","QUAD3D","Actual");
for (i=1;i<=NVAL;i++) {
xmax=0.1*i;
xmin = -xmax;
s=quad3d(func,xmin,xmax);
printf("%12.2f %12.6f %11.6f\n",
xmax,s,4.0*PI*pow(xmax,5.0)/5.0);
}
}
Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!
This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.
But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/