gcvt (3) Linux Manual Page

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:

(_XOPEN_SOURCE >= 500) ! (_POSIX_C_SOURCE >= 200112L)

 || /* Glibc since 2.19: */ _DEFAULT_SOURCE

 || /* Glibc versions <= 2.19: */ _SVID_SOURCE

Before glibc 2.12:

_SVID_SOURCE || _XOPEN_SOURCE >= 500

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 buf.

Attributes

For an explanation of the terms used in this section, see attributes(7).

Interface	Attribute	Value
gcvt()	Thread safety	MT-Safe

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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