# C exp() function

## C exp() function - Calculate exponential function

Syntax:

`double exp(double x)`

The exp() function is used to calculate the exponential value of a floating-point argument x ( ex , where e equals 2.17128128...).

Parameters:

Name Description Required /Optional
x The floating-point value to exponentiate the natural logarithm base e by. Required

Return value from exp()

• Upon successful completion, these functions shall return the exponential value of x.

Example: exp() function

The following example shows the usage of exp() function.

``````#include <math.h>
#include <stdio.h>
int main(void)
{
double x, y;

x = 5.0;
y = exp(x);
printf("exp( %lf ) = %lf\n", x, y);
x = 4.0;
y = exp(x);
printf("\nexp( %lf ) = %lf\n", x, y);
x = 3.0;
y = exp(x);
printf("\nexp( %lf ) = %lf\n", x, y);
}
``````

Output:

```exp( 5.000000 ) = 148.413159

exp( 4.000000 ) = 54.598150

exp( 3.000000 ) = 20.085537
```

C Programming Code Editor:

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