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0-terminated list of “pointers to body”

#include "body.h"

float totalVolume (body *bptr[])

{

int i = 0;

float volume = 0.;

body *b = bptr[i++];

while (b)

{

volume += b->GetVolume();

b = bptr[i++];

}

return volume;

}

This routine now calculates the total volume of all bodies in the list

This routine only sees (and knows about) “bodies”, it does not care whether a body is actually a cube or a cylinder. It will also work (without re-compilation!) with other classes of body which didn’t exist at the time we wrote this function, such as a sphere, a pyramid, or a cone.

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