Convert a floating-point number to a string
char *qecvt(long double number, int ndigits, int *decpt, int *sign);
char *qfcvt(long double number, int ndigits, int *decpt, int *sign);
char *qgcvt(long double number, int ndigit, char *buf);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
qecvt(), qfcvt(), qgcvt(): _SVID_SOURCE
The qecvt() and qfcvt() functions are not thread-safe.
The qgcvt() function is thread-safe.
SVr4. Not seen in most common UNIX implementations, but occurs in SunOS. Supported by glibc.
These functions are obsolete. Instead, snprintf(3) is recommended.
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