gcvt(3) Library Functions Manual gcvt(3) NAME gcvt - convert a floating-point number to a string LIBRARY Standard C library (libc, -lc) 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 2.17 (_XOPEN_SOURCE >= 500 && ! (_POSIX_C_SOURCE >= 200809L)) || /* glibc >= 2.20 */ _DEFAULT_SOURCE || /* glibc <= 2.19 */ _SVID_SOURCE glibc 2.12 to glibc 2.16: (_XOPEN_SOURCE >= 500 && ! (_POSIX_C_SOURCE >= 200112L)) || _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 pro‐ duces 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 │ └─────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘ STANDARDS Marked as LEGACY in POSIX.1-2001. POSIX.1-2008 removes the specification of gcvt(), recommending the use of sprintf(3) in‐ stead (though snprintf(3) may be preferable). SEE ALSO ecvt(3), fcvt(3), sprintf(3) Linux man-pages 6.03 2023-02-05 gcvt(3)