C++ exp()

C++ exp() returns exponential (e) raised to given number (argument).

exp(x) = e^x

Syntax

The syntax of C++ exp() is

exp(x)

where

ParameterDescription
xA double, float, long double, or any integral type value.

Returns

The return value depends on the type of value passed for parameter x.

The return value of exp(x) is

  • double if x is double or integral type.
  • float if x is float.
  • long double if x is long double.

The synopsis of exp() function is

double exp(double x);
float exp(float x);
long double exp(long double x);
double exp(T x); // for integral type argument values

exp() is a function of cmath library. Include cmath library in the program, if using exp() function.

Example

In this example, we read a value from user into variable x, and find exponential raised to this number x, using exp() function.

C++ Program

#include <iostream>
#include<cmath>
using namespace std;

int main() {
    double x;
    cout << "Enter a number : ";
    cin >> x;
    
    double result = exp(x);
    cout << "exp(" << x << ") : " << result << endl;
}

Output

Enter a number : 1
exp(1) : 2.71828
Program ended with exit code: 0
Enter a number : 0
exp(0) : 1
Program ended with exit code: 0
Enter a number : 10
exp(10) : 22026.5
Program ended with exit code: 0

Conclusion

In this C++ Tutorial, we learned the syntax of C++ exp(), and how to use this function to find exponential (e) raised to given number, with the help of examples.