{{keywords>wiki library source code example reference}}
====== exp ======

<code cpp>
    double exp(double);
</code>
calculates the exponential value of a number

===== cpp Sourcecode Example =====

<code cpp>     
#include <iostream> /* including standard library */
#include <cmath> /* including math library */

using namespace std;
int main ( void ) 
{
    double x;
    x = 9.0;

    //cout.setf(ios::fixed, ios::floatfield);
    cout.precision(8);

    cout << "the exponential value of " << x << " is " << exp(x) << endl;
    return 0;
}

</code>

==== output ====
   output:
   the exponential value of 9.0 is 8103.0839