gcvt(3) - f38

1gcvt(3)                    Library Functions Manual                    gcvt(3)
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NAME

6       gcvt - convert a floating-point number to a string
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LIBRARY

9       Standard C library (libc, -lc)
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SYNOPSIS

12       #include <stdlib.h>
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14       char *gcvt(double number, int ndigit, char *buf);
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16   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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18       gcvt():
19           Since glibc 2.17
20               (_XOPEN_SOURCE >= 500 && ! (_POSIX_C_SOURCE >= 200809L))
21                   || /* glibc >= 2.20 */ _DEFAULT_SOURCE
22                   || /* glibc <= 2.19 */ _SVID_SOURCE
23           glibc 2.12 to glibc 2.16:
24               (_XOPEN_SOURCE >= 500 && ! (_POSIX_C_SOURCE >= 200112L))
25                   || _SVID_SOURCE
26           Before glibc 2.12:
27               _SVID_SOURCE || _XOPEN_SOURCE >= 500
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DESCRIPTION

30       The gcvt() function converts number to a minimal length null-terminated
31       ASCII string and stores the result in buf.  It produces ndigit signifi‐
32       cant digits in either printf(3) F format or E format.
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RETURN VALUE

35       The gcvt() function returns buf.
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ATTRIBUTES

38       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
39       tributes(7).
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41       ┌────────────────────────────────────────────┬───────────────┬─────────┐
42       │Interface                                   │ Attribute     │ Value   │
43       ├────────────────────────────────────────────┼───────────────┼─────────┤
44       │gcvt()                                      │ Thread safety │ MT-Safe │
45       └────────────────────────────────────────────┴───────────────┴─────────┘
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STANDARDS

48       None.
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HISTORY

51       Marked as LEGACY in POSIX.1-2001.  POSIX.1-2008 removed it,  recommend‐
52       ing  the  use  of sprintf(3) instead (though snprintf(3) may be prefer‐
53       able).
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