double *diff;

/* diff is a pointer to an array */

diff = (double *) calloc(ndat,sizeof(double));

/* the pointer diff is now to a region with space reserved for ndat double precision numbers calloc initializes this region to 0*/

diff[i]=fmpoly(xdat,fdatr,fdati,5,i,ndbeg);

/* diff is addressed henceforth as though it had been dimensioned as
double diff[ndat]; */

/* if there is not enough space calloc returns NULL */

/* the space is released with the command

free(diff); */

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Start in cbooks.hlp look for alloca.

calloc, malloc Functions

#include <stdlib.h> For ANSI compatibility

void *calloc( size_t n, size_t size );

Description:

The calloc function allocates space on the Heap for an array of n objects, each of length size bytes. Each element is initialized to 0.

The malloc function does not initialize the elements to zero.