#include <stdlib.h> char * ecvt (double value, int ndigits, int *decpt, int *sign)
This function converts the value into a null-terminated string, and returns a pointer to that string.
ecvt works exactly like ecvtbuf (see section ecvtbuf), except
that it generates the string in an internal static buffer which is
overwritten on each call.
A pointer to the generated string.
not ANSI, not POSIX
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