gcvt(3) [ultrix man page]
ecvt(3) Library Functions Manual ecvt(3) Name ecvt, fcvt, gcvt - output conversion Syntax 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 The routine converts the value to a null-terminated string of ndigit ASCII digits and returns a pointer thereto. The position of the radix character 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. The routine is identical to except that the correct digit has been rounded for FORTRAN F-format output of the number of digits specified by ndigits. The routine converts the value to a null-terminated ASCII string in buf and returns a pointer to buf. It attempts to produce ndigit sig- nificant digits in FORTRAN F format if possible, otherwise E format is used, ready for printing. Trailing zeros may be suppressed. The symbol used to represent a radix character is obtained from the last successful call to category The symbol can be determined by call- ing: nl_langinfo (RADIXCHAR); If category has not been called successfully, or if the radix character is not defined for a supported language, the radix character defaults to a period (.). International Environment LC_NUMERIC If this environment is set and valid, uses the international language database named in the definition to determine radix character rules. LANG If this environment is set and valid, uses the international language database named in the definition to determine radix character rules. If is defined, its definition supercedes the definition of Restrictions The return values point to static data whose content is overwritten by each call. See Also setlocale(3), nl_langinfo(3int), printf(3int), printf(3s) Guide to Developing International Software ecvt(3)
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ecvt(3C) Standard C Library Functions ecvt(3C) NAME
ecvt, fcvt, gcvt - convert floating-point number to 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
The ecvt(), fcvt() and gcvt() functions convert floating-point numbers to null-terminated strings. ecvt() The ecvt() function converts value to a null-terminated string of ndigit digits (where ndigit is reduced to an unspecified limit determined by the precision of a double) and returns a pointer to the string. The high-order digit is non-zero, unless the value is 0. The low-order digit is rounded. The position of the radix character relative to the beginning of the string is stored in the integer pointed to by decpt (negative means to the left of the returned digits). The radix character 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. fcvt() The fcvt() function is identical to ecvt() except that ndigit specifies the number of digits desired after the radix point. The total num- ber of digits in the result string is restricted to an unspecified limit as determined by the precision of a double. gcvt() The gcvt() function converts value to a null-terminated string (similar to that of the %g format of printf(3C)) in the array pointed to by buf and returns buf. It produces ndigit significant digits (limited to an unspecified value determined by the precision of a double) in %f if possible, or %e (scientific notation) otherwise. A minus sign is included in the returned string if value is less than 0. A radix character is included in the returned string if value is not a whole number. Trailing zeros are suppressed where value is not a whole num- ber. The radix character is determined by the current locale. If setlocale(3C) has not been called successfully, the default locale, POSIX, is used. The default locale specifies a period (.) as the radix character. The LC_NUMERIC category determines the value of the radix character within the current locale. RETURN VALUES
The ecvt() and fcvt() functions return a pointer to a null-terminated string of digits. The gcvt() function returns buf. ERRORS
No errors are defined. USAGE
The return values from ecvt() and fcvt() might point to thread-specific data that can be overwritten by subsequent calls to these functions by the same thread. For portability to implementations conforming to earlier versions of Solaris, sprintf(3C) is preferred over this function. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Safe | +-----------------------------+-----------------------------+ SEE ALSO
printf(3C), setlocale(3C), sprintf(3C), attributes(5), standards(5) SunOS 5.10 18 May 2004 ecvt(3C)