GCVTSection: Linux Programmer's Manual (3)
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NAMEgcvt - convert a floating-point number to a string
#include <stdlib.h> char *gcvt(double number, size_t ndigit, char *buf);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
DESCRIPTIONThe 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.
RETURN VALUEThe gcvt() function returns the address of the string pointed to by buf.
CONFORMING TOMarked 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).
SEE ALSOecvt(3), fcvt(3), sprintf(3)
COLOPHONThis page is part of release 3.21 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.