Converts its argument to a null-terminated string of ASCII digits
    and returns the address of the string. The string is stored in a
    thread-specific memory location created by the Compaq C RTL.

    Format

      #include  <stdlib.h>

      char *ecvt  (double value, int ndigits, int *decpt, int *sign);

  Additional Information (explode) :

• Arguments
• Description
• Return Value