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─────Run-Time Library───────────────────────────────────────────────────────
 
     The exp function returns the exponential function of its floating-
     point argument <x>.
 
     The _expl function uses an 80-bit long double form of arguments
     and return values. In all other respects, it is identical to the
     regular function.
 
     Return Value
 
     These functions return e^x. The functions return HUGE_VAL (or
     _LHUGE_VAL for _expl) on overflow and set errno to ERANGE; on
     underflow, they return 0 but do not set errno. This behavior can
     be changed with the _matherr function.
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