VMS Help
CRTL, tgamma, Return Values
 *Conan The Librarian 

    n                  Upon success, the gamma function of x.
    -1                 If x is negative. errno is set to EDOM.
    HUGE_VAL           Overflow occurred, or x is 0. errno is set to
                       ERANGE.
    NaN                If x is NaN or -Inf. errno is set to EDOM.
    x                  If x is +Inf.
  Close     Help