This documentation is archived and is not being maintained.

# exp, expf

Visual Studio 2010

Calculates the exponential.

```double exp(
double x
);
float exp(
float x
);  // C++ only
long double exp(
long double x
);  // C++ only
float expf(
float x
);
```

## Parameters

x

Floating-point value.

## Return Value

The exp function returns the exponential value of the floating-point parameter, x, if successful. That is, the result is e to the power x, where e is the base of the natural logarithm. On overflow, the function returns INF (infinite) and on underflow, exp returns 0.

Input

SEH Exception

Matherr Exception

± QNAN,IND

None

_DOMAIN

± ∞

INVALID

_DOMAIN

x ≥ 7.097827e+002

INEXACT+OVERFLOW

OVERFLOW

X ≤ -7.083964e+002

INEXACT+UNDERFLOW

UNDERFLOW

exp has an implementation that uses Streaming SIMD Extensions 2 (SSE2). See _set_SSE2_enable for information and restrictions on using the SSE2 implementation.

## Remarks

C++ allows overloading, so you can call overloads of exp. In a C program, exp always takes and returns a double.

## Requirements

Function

exp, expf

<math.h>

For additional compatibility information, see Compatibility in the Introduction.

## Example

```// crt_exp.c

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

int main( void )
{
double x = 2.302585093, y;

y = exp( x );
printf( "exp( %f ) = %f\n", x, y );
}
```
`exp( 2.302585 ) = 10.000000`