In cube_out 100 bytes are allocated to hold the output string. Instead using a bound on the size of g format output and separation characters, this bound times twice the dimension (possibly plus a small constant for parens and terminating 0 byte) should be used.
With this approach you might want to add specific precision specification in case the default precision in glibc changes in the future. ---------------------------(end of broadcast)--------------------------- TIP 4: Don't 'kill -9' the postmaster
