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ecvt(3) [bsd man page]

ECVT(3) 						     Library Functions Manual							   ECVT(3)

NAME
ecvt, fcvt, gcvt - output conversion SYNOPSIS
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; DESCRIPTION
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 (negative 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. SEE ALSO
printf(3) BUGS
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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ECVT(3) 						   BSD Library Functions Manual 						   ECVT(3)

NAME
ecvt, fcvt, gcvt -- convert double to ASCII string SYNOPSIS
#include <stdlib.h> char * ecvt(double value, int ndigit, int * restrict decpt, int * restrict sign); char * fcvt(double value, int ndigit, int * restrict decpt, int * restrict sign); char * gcvt(double value, int ndigit, char *buf); DESCRIPTION
These functions are provided for compatibility with legacy code. New code should use the snprintf(3) function for improved safety and porta- bility. The ecvt(), fcvt() and gcvt() functions convert the double precision floating-point number value to a NUL-terminated ASCII string. The ecvt() function converts value to a NUL-terminated string of exactly ndigit digits and returns a pointer to that string. The result is padded with zeroes from left to right as needed. There are no leading zeroes unless value itself is 0. The least significant digit is rounded in an implementation-dependent manner. The position of the decimal point relative to the beginning of the string is stored in decpt. A negative value indicates that the decimal point is located to the left of the returned digits (this occurs when there is no whole number component to value). If value is zero, it is unspecified whether the integer pointed to by decpt will be 0 or 1. The decimal point itself is not included in the returned string. If the sign of the result is negative, the integer pointed to by sign is non-zero; otherwise, it is 0. If the converted value is out of range or is not representable, the contents of the returned string are unspecified. The fcvt() function is identical to ecvt() with the exception that ndigit specifies the number of digits after the decimal point (zero-padded as needed). The gcvt() function converts value to a NUL-terminated string similar to the %g printf(3) format specifier and stores the result in buf. It produces ndigit significant digits similar to the %f printf(3) format specifier where possible. If ndigit does allow sufficient precision, the result is stored in exponential notation similar to the %e printf(3) format specifier. If value is less than zero, buf will be prefixed with a minus sign. A decimal point is included in the returned string if value is not a whole number. Unlike the ecvt() and fcvt() func- tions, buf is not zero-padded. RETURN VALUES
The ecvt(), fcvt() and gcvt() functions return a NUL-terminated string representation of value. WARNINGS
The ecvt() and fcvt() functions return a pointer to internal storage space that will be overwritten by subsequent calls to either function. The maximum possible precision of the return value is limited by the precision of a double and may not be the same on all architectures. The snprintf(3) function is preferred over these functions for new code. SEE ALSO
printf(3), strtod(3) STANDARDS
The ecvt(), fcvt() and gcvt() functions conform to IEEE Std 1003.1-2001 (``POSIX.1''). BSD
May 31, 2007 BSD
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