From 82ba818ff456bcd6d56a06226e3f27e98fbb55c3 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Thu, 14 Aug 2025 22:58:58 -0500 Subject: removing all downloaded devdocs files --- devdocs/c/numeric%2Fmath%2Fexp2.html | 77 ------------------------------------ 1 file changed, 77 deletions(-) delete mode 100644 devdocs/c/numeric%2Fmath%2Fexp2.html (limited to 'devdocs/c/numeric%2Fmath%2Fexp2.html') diff --git a/devdocs/c/numeric%2Fmath%2Fexp2.html b/devdocs/c/numeric%2Fmath%2Fexp2.html deleted file mode 100644 index 66fa43ca..00000000 --- a/devdocs/c/numeric%2Fmath%2Fexp2.html +++ /dev/null @@ -1,77 +0,0 @@ -

exp2, exp2f, exp2l

Defined in header <math.h> 
float       exp2f( float n );
-		 (1) (since C99) 
double      exp2( double n );
-		 (2) (since C99) 
long double exp2l( long double n );
-		 (3) (since C99)
Defined in header <tgmath.h> 
#define exp2( n )
-		 (4) (since C99)
-1-3) Computes 2 raised to the given power n.
-4) Type-generic macro: If n has type long double, exp2l is called. Otherwise, if n has integer type or the type double, exp2 is called. Otherwise, exp2f is called.

Parameters

- -
n - floating point value

Return value

If no errors occur, the base-2 exponential of n (2n) is returned.

-

If a range error due to overflow occurs, +HUGE_VAL, +HUGE_VALF, or +HUGE_VALL is returned.

-

If a range error occurs due to underflow, the correct result (after rounding) is returned.

-

Error handling

Errors are reported as specified in math_errhandling.

-

If the implementation supports IEEE floating-point arithmetic (IEC 60559),

-

Example

#include <stdio.h>
-#include <math.h>
-#include <float.h>
-#include <errno.h>
-#include <fenv.h>
-// #pragma STDC FENV_ACCESS ON
-int main(void)
-{
-    printf("exp2(5) = %f\n", exp2(5));
-    printf("exp2(0.5) = %f\n", exp2(0.5));
-    printf("exp2(-4) = %f\n", exp2(-4));
-    // special values
-    printf("exp2(-0.9) = %f\n", exp2(-0.9));
-    printf("exp2(-Inf) = %f\n", exp2(-INFINITY));
-    //error handling
-    errno = 0; feclearexcept(FE_ALL_EXCEPT);
-    printf("exp2(1024) = %f\n", exp2(1024));
-    if(errno == ERANGE) perror("    errno == ERANGE");
-    if(fetestexcept(FE_OVERFLOW)) puts("    FE_OVERFLOW raised");
-}

Possible output:

-
exp2(5) = 32.000000
-exp2(0.5) = 1.414214
-exp2(-4) = 0.062500
-exp2(-0.9) = 0.535887
-exp2(-Inf) = 0.000000
-exp2(1024) = Inf
-    errno == ERANGE: Result too large
-    FE_OVERFLOW raised

References

See also

- - - -
-
(C99)(C99)
 computes e raised to the given power (\({\small e^x}\)ex)
(function)
-
(C99)(C99)(C99)
 computes e raised to the given power, minus one (\({\small e^x-1}\)ex-1)
(function)
-
(C99)(C99)(C99)
 computes base-2 logarithm (\({\small \log_{2}{x} }\)log2(x))
(function)
C++ documentation for exp2
-

- © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
- https://en.cppreference.com/w/c/numeric/math/exp2 -

-
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