function
<cmath> <ctgmath>
exp
double exp (double x); float expf (float x);long double expl (long double x);
double exp (double x); float exp (float x);long double exp (long double x);
double exp (double x); float exp (float x);long double exp (long double x); double exp (T x); // additional overloads for integral types
Compute exponential function
Returns the base-e exponential function of x, which is e raised to the power x: ex.
Header
<tgmath.h> provides a type-generic macro version of this function.
Parameters
- x
- Value of the exponent.
Return Value
Exponential value of x.
If the magnitude of the result is too large to be represented by a value of the return type, the function returns HUGE_VAL (or HUGE_VALF or HUGE_VALL ) with the proper sign, and an overflow range error occurs:
If an overflow
range error occurs, the global variable
errno is set to
ERANGE .
Example
1
2
3
4
5
6
7
8
9
10
11
12
/* exp example */
#include <stdio.h> /* printf */
#include <math.h> /* exp */
int main ()
{
double param, result;
param = 5.0;
result = exp (param);
printf ("The exponential value of %f is %f.\n", param, result );
return 0;
}
Output:
The exponential value of 5.000000 is 148.413159.
See also
- log
- Compute natural logarithm (function)
- pow
- Raise to power (function)