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c++ - Why doesn't drand48() and srand48() work?

Excuse me, I am no experienced C programmer, but I really need help.
I've installed DMC and if I write a program normmean.c containing this lines;

      unsigned short myseed;
      myseed=750908;
      srand48(myseed);

...and also:

      double chi;
      chi=drand48();

.. I get an error when compiling. Running "dmc normmean" yields

"normmean.obj(normmean) Error 42: Symbol Undefined _srand48" and equally for
"_drand". What is wrong? The same program (attached) worked well when compiled
with gcc at my school.
Oct 06 2006