Library /sys$common/syshlp/helplib.hlb  —  CRTL  exp  Return Values
    x                  The exponential value of the argument.
    HUGE_VAL           Overflow occurred; errno is set to ERANGE.
    0                  Underflow occurred; errno is set to ERANGE.
    NaN                x is NaN; errno is set to EDOM.
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