GCVT

gcvt − convert a floating-point number to a string.

#include <stdlib.h>

char *gcvt(double number, size_t ndigit, char *buf);

The 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() F format or E format.

The gcvt() function returns the address of the string pointed to by buf.

ecvt(3), fcvt(3), sprintf(3)