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BSD 2.11 - man page for ecvt (bsd section 3)

ECVT(3) 				       Library Functions Manual 				      ECVT(3)

ecvt, fcvt, gcvt - output conversion
char *ecvt(value, ndigit, decpt, sign) double value; int ndigit, *decpt, *sign; char *fcvt(value, ndigit, decpt, sign) double value; int ndigit, *decpt, *sign; char *gcvt(value, ndigit, buf) double value; char *buf;
Ecvt converts the value to a null-terminated string of ndigit ASCII digits and returns a pointer thereto. The position of the decimal point relative to the beginning of the string is stored indirectly through decpt (neg- ative means to the left of the returned digits). If the sign of the result is negative, the word pointed to by sign is non-zero, otherwise it is zero. The low-order digit is rounded. Fcvt is identical to ecvt, except that the correct digit has been rounded for Fortran F-format output of the number of digits specified by ndigits. Gcvt converts the value to a null-terminated ASCII string in buf and returns a pointer to buf. It attempts to produce ndigit significant digits in Fortran F format if possible, otherwise E format, ready for printing. Trailing zeros may be suppressed.
The return values point to static data whose content is overwritten by each call. 7th Edition May 15, 1985 ECVT(3)
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