C library - exp() function

The C library exp() function of type double accept the single parameter(x) that returns the value of exponent raised to the base power.

In mathematics, an exponent is a small integer that positioned in the upper right of a base number.

Syntax

Following is the syntax of the C library function exp() −

double exp(double x)

Parameters

This function accepts only a single parameter −

• x − This is the floating point value.

Return Value

This function returns the exponential value of x.

Example 1

The C library program shows the usage of exp() function.

#include <stdio.h>
#include <math.h>

int main () {
   double x = 0;
  
   printf("The exponential value of %lf is %lf\n", x, exp(x));
   printf("The exponential value of %lf is %lf\n", x+1, exp(x+1));
   printf("The exponential value of %lf is %lf\n", x+2, exp(x+2));
   
   return(0);
}

Output

On execution of above code, we get the following result −

The exponential value of 0.000000 is 1.000000
The exponential value of 1.000000 is 2.718282
The exponential value of 2.000000 is 7.389056

Example 2

Below the program demonstrate the usage of exp() in a for loop.

#include <stdio.h>
#include <math.h>

int main() {
   printf("Exponential Series (e^x) for x from 1 to 10:\n");
   for (int x = 1; x <= 10; ++x) {
       double result = exp(x);
       printf("e^%d = %.6lf\n", x, result);
   }

   return 0;
}

Output

After executing the above code, we get the following result −

Exponential Series (e^x) for x from 1 to 10:
e^1 = 2.718282
e^2 = 7.389056
e^3 = 20.085537
e^4 = 54.598150
e^5 = 148.413159
e^6 = 403.428793
e^7 = 1096.633158
e^8 = 2980.957987
e^9 = 8103.083928
e^10 = 22026.465795

Example 3

In this program, it illustrates how to use exp() to find (e^x), where (x) is any real number.

#include <stdio.h>
#include <math.h>

int main() {
   double x = 3.0;
   double result = exp(x);

   printf("e raised to the power %.2lf = %.2lf\n", x, result);
   return 0;
}

Output

The above code produces the following result −

e raised to the power 3.00 = 20.09