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)):
Since glibc 2.12: (_XOPEN_SOURCE >= 500) ! (_POSIX_C_SOURCE >= 200112L) || /* Glibc since 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _SVID_SOURCE
_SVID_SOURCE || _XOPEN_SOURCE >= 500
The gcvt() function returns the address of the string pointed to by
For an explanation of the terms used in this section, see attributes(7).
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