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COMMAFLT.C
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1996-11-24
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/* +++Date last modified: 02-Nov-1995 */
/*
** COMMAFLT.C - Format a double using commas as thousands separators
** and a specified number of significant fractional digits.
**
** public domain by Bruce Wedding and Kurt Kuzba
*/
#include <stdio.h>
#include "numcnvrt.h"
#include "snip_str.h"
char *comma_float( double num, char *buf, int dec)
{
char tmp[80];
int bf = 0, cm = 0, tm = 9 - dec + (!dec);
sprintf(tmp, "%.9f", num);
strrev(tmp);
if(dec)
{
while( (buf[bf++] = tmp[tm++]) != '.')
;
while((buf[bf++] = tmp[tm++]) != 0)
{
if(++cm % 3 == 0 && tmp[tm])
buf[bf++] = ',';
}
}
return strrev(buf);
}
#ifdef TEST
#include <stdio.h>
int main( void )
{
int i;
char result[80];
double num[10] = {
1.98765, 12.98765, 123.98765,
1234.98765, 12345.98765, 123456.98765,
1234567.98765, 12345678.98765, 123456789.98765,
1234567890.98765 };
for ( i = 0; i < 10; i++ )
printf("Before: %-24.5f After: %s \n",
num[i], comma_float(num[i], result, 6));
return 0;
}
#endif /* TEST */