Manpages - gcvt.3

gcvt - convert a floating-point number to a string

  #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 2.17
          (_XOPEN_SOURCE >= 500 && ! (_POSIX_C_SOURCE >= 200809L))
              || /* Glibc >= 2.20 */ _DEFAULT_SOURCE
              || /* Glibc <= 2.19 */ _SVID_SOURCE
      Glibc versions 2.12 to 2.16:
          (_XOPEN_SOURCE >= 500 && ! (_POSIX_C_SOURCE >= 200112L))
              || _SVID_SOURCE
      Before glibc 2.12:
          _SVID_SOURCE || _XOPEN_SOURCE >= 500

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.

The *gcvt*() function returns buf.

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

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).

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

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