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
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| /* 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)