C++ Math expm1
The function computes the exponential 'e' raised to the power a given number minus 1.
Suppose a number is 'x'
Example
expm1(x) = e<sup>x</sup> - 1;
Syntax
Example
float expm1(float x);
double expm1(double x);
long double expm1(long double x);
double expm1(integral x);
Note: The return_type can be float, double or long double.
Parameter
x : It is the value of the exponent.
Return value
It returns 'e' raised to the power x minus -1.
Example 1
Let's see a simple example
Example
#include <iostream>
#include<math.h>
using namespace std;
int main()
{
int x=6;
std::cout << "Value of x is : " <<x <<std::endl;
cout<<"expm1(x) = "<<expm1(x);
return 0;
}
Output:
Output
Value of x is : 6
expm1(x) = 402.429
In this example, the value of x is 6. The expm1 function computes 'e' raised to the power 6 minus one.
Example 2
Let's see another simple example
Example
#include <iostream>
#include<math.h>
using namespace std;
int main()
{
float x=9.8;
std::cout << "Value of x is : " <<x <<std::endl;
cout<<"expm1(x) = "<<expm1(x);
return 0;
}
Output:
Output
Value of x is : 9.8
expm1(x) = 18032.7
In this example, value of x is 9.8. The expm1 function computes 'e' raised to the power 9.8 minus one.