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//**************************************
//
//INCLUDE files for :Convert floating po
// int value to engineering notation
//**************************************
//
/* +++Date last modified: 05-Jul-1997 */
/*
** NUMCNVRT.H - Header file for SNIPPETS numerical <=> string conversions
*/
#ifndef NUMCNVRT__H
#define NUMCNVRT__H
#include
#include "sniptype.h"
#include "round.h"
#include "pi.h"
#define R_ERROR -2 /* EVAL.C Range error*/
/*
** Callable library functions begin here
*/
char * base_convert(const char *in, char *out,
size_t len, int rin, int rout);/* Bascnvrt.C */
char * comma_float(double num, char *buf, int dec); /* Commaflt.C */
size_t commafmt(char *buf, int bufsize, long N); /* Commafmt.C */
char * eng(double value, int places);/* Eng.C */
int evaluate(char *line, double *val);/* Eval.C */
char * fmt_money(double amt);/* Fmtmoney.C */
longhexorint(const char *string); /* Hexorint.C */
char * ltostr(long num, char *string,
size_t max_chars, unsigned base); /* Ltostr.C*/
char * ordinal_text(int number); /* Ord_Text.C */
int scanfrac (const char buf[], double *f);/* Scanfrac.C */
unsigned int hstr_i(char *cptr); /* Hstr_I.C*/
char *long2roman(long val, char *buf, size_t buflen); /* L2Roman.C */
long roman2long(const char *str);/* Roman2L.C */
#if defined(__ZTC__) && !defined(__SC__)
char * ltoa(long val, char *buf, int base); /* Ltoa.C */
#endif
/*
** File: STR27SEG.C
*/
struct Seg7disp {
unsigned seg_a : 1;
unsigned seg_b : 1;
unsigned seg_c : 1;
unsigned seg_d : 1;
unsigned seg_e : 1;
unsigned seg_f : 1;
unsigned seg_g : 1;
};
char *str27seg(char *string);
#endif /* NUMCNVRT__H */
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//
/* +++Date last modified: 05-Jul-1997 */
/* ENG.C - Format floating point in engineering notation */
/* Released to public domain by author, David Harmon, Jan. 1994*/
#include
#include "snipmath.h"
char *eng(double value, int places)
{
const char * const prefixes[] = {
"a", "f", "p", "n", "?", "m", "", "k", "M", "G", "T"
};
int p = 6;
static char result[30];
char *res = result;
if (value < 0.)
{
*res++ = '-';
value = -value;
}
while (value != 0 && value < 1. && p > 0)
{
value *= 1000.;
p--;
}
while (value != 0 && value > 1000. && p < 10 )
{
value /= 1000.;
p++;
}
if (value > 100.)
places--;
if (value > 10.)
places--;
sprintf(res, "%.*f %s", places-1, value, prefixes[p]);
return result;
}
#ifdef TEST
#include
main()
{
double w;
for (w = 1e-19; w < 1e16; w *= 42)
printf(" %g W = %sW\n", w, eng(w, 3));
return 0;
}
#endif /* TEST */