exp2(3m) - osol9

1exp2(3M)                Mathematical Library Functions                exp2(3M)
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NAME

6       exp2, exp2f, exp2l - exponential base 2 functions
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SYNOPSIS

9       c99 [ flag... ] file... -lm [ library... ]
10       #include <math.h>
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12       double exp2(double x);
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15       float exp2f(float x);
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18       long double exp2l(long double x);
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DESCRIPTION

22       These functions compute the base-2 exponential of x.
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RETURN VALUES

25       Upon successful completion, these functions return 2^x.
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28       If  the  correct  value  would cause overflow, a range error occurs and
29       exp2(), exp2f(), and exp2l() return the value of  the  macro  HUGE_VAL,
30       HUGE_VALF, and HUGE_VALL, respectively.
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33       If x is NaN, a NaN is returned.
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36       If x is ±0, 1 is returned.
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39       If x is −Inf, +0 is returned.
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42       If x is +Inf, x is returned.
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ERRORS

45       These functions will fail if:
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47       Range Error    The result overflows.
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49                      If    the   integer   expression   (math_errhandling   &
50                      MATH_ERREXCEPT) is non-zero, the overflow floating-point
51                      exception will be raised.
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USAGE

55       An  application  wanting to check for exceptions should call feclearex‐
56       cept(FE_ALL_EXCEPT) before  calling  these  functions.  On  return,  if
57       fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is
58       non-zero, an exception has been raised. An  application  should  either
59       examine the return value or check the floating point exception flags to
60       detect exceptions.
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ATTRIBUTES

63       See attributes(5) for descriptions of the following attributes:
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68       ┌─────────────────────────────┬─────────────────────────────┐
69       │      ATTRIBUTE TYPE         │      ATTRIBUTE VALUE        │
70       ├─────────────────────────────┼─────────────────────────────┤
71       │Interface Stability          │Standard                     │
72       ├─────────────────────────────┼─────────────────────────────┤
73       │MT-Level                     │MT-Safe                      │
74       └─────────────────────────────┴─────────────────────────────┘
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