C++ Math expm1() Function

by Online Tutorials Library July 22, 2022

C++ Math expm1()

The function computes the exponential ‘e’ raised to the power a given number minus 1.

Suppose a number is ‘x’

Syntax

  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

  #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:

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

  #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:

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.

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