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/** d1mach - determine machine precision. Instead of using the
* original fortran version (or f2c'd version), use this C code
* instead. This is code is actually in a comment in the original
* fortran code.
*
* Note, that by using this C code, d1mach is now thread safe,
* whereas, the f2c code was not.
*
*/
/* Standard C source for D1MACH */
#include <stdio.h>
#include <float.h>
#include <math.h>
#include "v3p_f2c_original.h"
double d1mach_(integer *i)
{
switch(*i)
{
case 1: return DBL_MIN;
case 2: return DBL_MAX;
case 3: return DBL_EPSILON/FLT_RADIX;
case 4: return DBL_EPSILON;
case 5: return log10((double)FLT_RADIX);
}
fprintf(stderr, "invalid argument: d1mach(%ld)\n", (long) *i);
return 0; /* some compilers demand return values */
}
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