C++ Math expm1() Function

C++ Math expm1() Function with tutorial for beginners and professionals with examples on isgreaterequal(), less(), islessequal(), islessgreater(), isunordered(), exp(), frexp(), ldexp(), log(), log10(), modf(), exp2(), expm1(), log1p(), log2(), logb(), scalbn(), scalbln() etc.

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C++ Math expm1()

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

Suppose a number is 'x'

expm1(x) = e^x - 1;

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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