# exp() function C++

The exp() function in C++ returns the exponential (Euler’s number) e (or 2.71828) raised to the given argument.

Syntax for returning exponential e:
result=exp()

Parameter:
The function can take any value i.e, positive, negative or zero in its parameter and returns result in int, double or float or long double.

Return Value:
The exp() function returns the value in the range of [0, inf].

Error:
It shows error when we pass more then one argument in exp function

Application:
Given below is an example of application of exp() function

 #include  using namespace std;     // function to explain use of exp() function  double application(double x)  {      double result = exp(x);      cout << "exp(x) = " << result << endl;  }     // driver program  int main()  {      double x = 10;      cout << application(x);      return 0;  }

Output:

exp(x) = 22026.5


Applications of e (mathematical constant):

• Compound Interest : An account that starts at \$1 and offers an annual interest rate of R will, after t years, yield eRt dollars with continuous compounding (Here R is the decimal equivalent of the rate of interest expressed as a percentage, so for 5% interest, R = 5/100 = 0.05)
• Value of below expression is e. • The probability that a gambler never wins if he/she tries million times in a game where chances of winning in every trial is one by million is close to 1/e.
• The number e is the sum of the infinite series Source : Wiki

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