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Name

gcvt - convert a floating-point number to a string

Synopsis


#include <stdlib.h>
char *gcvt(double number, int ndigit, char *buf);

Feature Test Macro Requirements for glibc (see feature_test_macros(7) ):

gcvt():

Since glibc 2.12: 

_SVID_SOURCE ||
    (_XOPEN_SOURCE >= 500 ||
        _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED) &&
    !(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600)
Before glibc 2.12:
_SVID_SOURCE || _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE &&
_XOPEN_SOURCE_EXTENDED

Description

The gcvt() function converts number to a minimal length null-terminated ASCII string and stores the result in buf. It produces ndigit significant digits in either printf(3) F format or E format.

Return Value

The gcvt() function returns the address of the string pointed to by buf.

Conforming to

Marked as LEGACY in POSIX.1-2001. POSIX.1-2008 removes the specification of gcvt(), recommending the use of sprintf(3) instead (though snprintf(3) may be preferable).

See Also

ecvt(3) , fcvt(3) , sprintf(3)

Colophon

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