## Linux and UNIX Man Pages

Test Your Knowledge in Computers #1008
Difficulty: Medium
A power series will converge for some values of the variable x and may diverge for others.
True or False?

# exp2(3m) [opensolaris man page]

```exp2(3M)						  Mathematical Library Functions						  exp2(3M)

NAME
exp2, exp2f, exp2l - exponential base 2 functions

SYNOPSIS
c99 [ flag... ] file... -lm [ library... ]
#include <math.h>

double exp2(double x);

float exp2f(float x);

long double exp2l(long double x);

DESCRIPTION
These functions compute the base-2 exponential of x.

RETURN VALUES
Upon successful completion, these functions return 2^x.

If  the	correct  value would cause overflow, a range error occurs and exp2(), exp2f(), and exp2l() return the value of the macro HUGE_VAL,
HUGE_VALF, and HUGE_VALL, respectively.

If x is NaN, a NaN is returned.

If x is +-0, 1 is returned.

If x is -Inf, +0 is returned.

If x is +Inf, x is returned.

ERRORS
These functions will fail if:

Range Error    The result overflows.

If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, the overflow  floating-point  exception  will	be
raised.

USAGE
An  application	wanting  to  check  for  exceptions should call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if
fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an exception  has  been  raised.  An  application  should
either examine the return value or check the floating point exception flags to detect exceptions.

ATTRIBUTES
See attributes(5) for descriptions of the following attributes:

+-----------------------------+-----------------------------+
|      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
+-----------------------------+-----------------------------+
|Interface Stability	     |Standard			   |
+-----------------------------+-----------------------------+
|MT-Level		     |MT-Safe			   |
+-----------------------------+-----------------------------+

exp(3M), feclearexcept(3M), fetestexcept(3M), isnan(3M), log(3M), math.h(3HEAD), attributes(5), standards(5)

SunOS 5.11							    12 Jul 2006 							  exp2(3M)```

## Check Out this Related Man Page

```exp2(3M)						  Mathematical Library Functions						  exp2(3M)

NAME
exp2, exp2f, exp2l - exponential base 2 functions

SYNOPSIS
c99 [ flag... ] file... -lm [ library... ]
#include <math.h>

double exp2(double x);

float exp2f(float x);

long double exp2l(long double x);

DESCRIPTION
These functions compute the base-2 exponential of x.

RETURN VALUES
Upon successful completion, these functions return 2^x.

If  the	correct  value would cause overflow, a range error occurs and exp2(), exp2f(), and exp2l() return the value of the macro HUGE_VAL,
HUGE_VALF, and HUGE_VALL, respectively.

If x is NaN, a NaN is returned.

If x is +-0, 1 is returned.

If x is -Inf, +0 is returned.

If x is +Inf, x is returned.

ERRORS
These functions will fail if:

Range Error    The result overflows.

If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, the overflow  floating-point  exception  will	be
raised.

USAGE
An  application	wanting  to  check  for  exceptions should call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if
fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an exception  has  been  raised.  An  application  should
either examine the return value or check the floating point exception flags to detect exceptions.

ATTRIBUTES
See attributes(5) for descriptions of the following attributes:

+-----------------------------+-----------------------------+
|      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
+-----------------------------+-----------------------------+
|Interface Stability	     |Standard			   |
+-----------------------------+-----------------------------+
|MT-Level		     |MT-Safe			   |
+-----------------------------+-----------------------------+