function
<cmath> <ctgmath>
exp2
double exp2 (double x);
float exp2f (float x);
long double exp2l (long double x);
double exp2 (double x);
float exp2 (float x);
long double exp2 (long double x);
double exp2 (T x); // additional overloads for integral types
Compute binary exponential function
Returns the base-2 exponential function of x, which is 2
raised to the power x: 2x
.
Header
<tgmath.h> provides a type-generic macro version of this function.
Additional overloads are provided in this header (
<cmath>
) for the
integral types: These overloads effectively cast
x to a
double
before calculations (defined for
T being any
integral type).
Parameters
- x
- Value of the exponent.
Example
1 2 3 4 5 6 7 8 9 10 11 12
|
/* exp2 example */
#include <stdio.h> /* printf */
#include <math.h> /* exp2 */
int main ()
{
double param, result;
param = 8.0;
result = exp2 (param);
printf ("2 ^ %f = %f.\n", param, result );
return 0;
}
| |
Output:
2 ^ 8.000000 is 256.000000.
|
See also
- log2
- Compute binary logarithm (function
)
- pow
- Raise to power (function
)
- exp
- Compute exponential function (function
)